Assignment Prompt & Instructions
Respond the 2 posts attached following the instructions and rubric
**files (1)**
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**## post12responses.docx**
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| CONTRIBUTION TO THE DISCUSSION: First Response (20 possible points) | **20 to >19.0 ptsExcellent** Discussion response: • Significantly contributes to the quality of the discussion/interaction and thinking and learning. • Provides rich and relevant examples and thought-provoking ideas that demonstrates new perspectives, and synthesis of ideas supported by the literature. • Scholarly sources are correctly cited and formatted. • First response is supported by 2 or more relevant examples and research/evidence from a variety of scholarly sources including course and outside readings. • Posts on separate day.<br> <br>**19 to >15.0 ptsGood** Discussion response: • Contributes to the quality of the interaction/discussion and learning. • Provides relevant examples and/or thought-provoking ideas • Scholarly sources are correctly cited and formatted. • First response is supported by 2 or more relevant examples and research/evidence from a variety of scholarly sources including course and outside readings. • Posts on separate day.<br> <br>**15 to >12.0 ptsFair** Discussion response: • Minimally contributes to the quality of the interaction/discussion and learning. • Provides few examples to support thoughts. • Information provided lacks evidence of critical thinking or synthesis of ideas. • There is a lack of support from relevant scholarly research/evidence. • Posts on separate day.<br> <br>**12 to >0 ptsPoor** Discussion response: • Does not contribute to the quality of the interaction/discussion and learning. • Lacks relevant examples or ideas. • There is a lack of support from relevant scholarly research/evidence. • Posts on same day. | 20 pts |
| This criterion is linked to a Learning OutcomeCONTRIBUTION TO THE DISCUSSION: Second Response (20 possible points) | **20 to >19.0 ptsExcellent** Discussion response: • Significantly contributes to the quality of the discussion/interaction and thinking and learning. • Provides relevant examples and thought-provoking ideas that demonstrates new perspectives, and extensive synthesis of ideas supported by the literature. • Second response is supported by 2 or more relevant examples and research/evidence from a variety of scholarly sources including course and outside readings. • Scholarly sources are correctly cited and formatted. • Posts on separate day.<br> <br>**19 to >15.0 ptsGood** Discussion response: • Contributes to the quality of the interaction/discussion and learning. • Provides relevant examples and/or thought-provoking ideas • Second response is supported by 2 or more relevant examples and research/evidence from a variety of scholarly sources including course and outside readings. • Scholarly sources are correctly cited and formatted. • Posts on separate day.<br> <br>**15 to >12.0 ptsFair** Discussion response: • Minimally contributes to the quality of the interaction/discussion and learning. • Provides few examples to support thoughts. • Information provided lacks evidence of critical thinking or synthesis of ideas. • Minimal scholarly sources provided to support post. • Posts on separate day.<br> <br>**12 to >0 ptsPoor** Discussion response: • Does not contribute to the quality of the interaction/discussion and learning. • Lacks relevant examples or ideas. • No sources provided. • Posts on same day. | 20 pts |
| This criterion is linked to a Learning OutcomeQUALITY OF WRITING (10 possible points) | **10 to >9.0 ptsExcellent** Discussion postings and responses exceed doctoral level writing expectations: • Use Standard Academic English that is clear, concise, and appropriate to doctoral level writing. • Make few if any errors in spelling, grammar, that does not affect clear communication. • Uses correct APA 7 format as closely as possible given the constraints of the online platform. • Are positive, courteous, and respectful when offering suggestions, constructive feedback, or opposing viewpoints.<br> <br>**9 to >8.0 ptsGood** Discussion postings and responses meet doctoral level writing expectations: • Use Standard Academic English that is clear and appropriate to doctoral level writing • Makes a few errors in spelling, grammar, that does not affect clear communication. • Uses correct APA 7 format as closely as possible given the constraints of the online platform. • Are courteous and respectful when offering suggestions, constructive feedback, or opposing viewpoints.<br> <br>**8 to >6.0 ptsFair** Discussion postings and responses are somewhat below doctoral level writing expectations: • Posts contains multiple spelling, grammar, and/or punctuation deviations from Standard Academic English that affect clear communication. • Numerous errors in APA 7 format • May be less than courteous and respectful when offering suggestions, feedback, or opposing viewpoints.<br> <br>**6 to >0 ptsPoor** Discussion postings and responses are well below doctoral level writing expectations: • Posts contains multiple spelling, grammar, and/or punctuation deviations from Standard Academic English that affect clear communication. • Uses incorrect APA 7 format • Are discourteous and disrespectful when offering suggestions, feedback, or opposing viewpoints. | |
Read a selection of your classmates’ posts and respond to at least two of your classmates on two different days by expanding upon their reflections, making connections to your perceptions, and offering additional insights.
Note: Your responses to classmates should be substantial supported with scholarly evidence from your research and/or the Learning Resources, and properly cited using APA Style. Personal anecdotes are acceptable as part of a meaningful response, but cannot stand alone as a response. Your responses should enrich the initial post by supporting and/or offering a fresh viewpoint, and be constructive, thereby enhancing the learning experience for all students.
**Post 1:**
Levels of Measurement, Statistical Comparisons, and the Standardized Infection Ratio
A clear understanding of levels of measurement and statistical methods is essential when evaluating nursing research, quality improvement (QI) initiatives, and evidence-based practice (EBP) projects. Correctly identifying variables and statistical approaches allows researchers and clinicians to interpret data accurately and apply findings to improve patient outcomes.
Continuous and Categorical Variables
Variables in research are categorized according to their level of measurement, which determines how they can be analyzed statistically (Gray & Grove, 2020). Continuous variables represent numerical measurements that can take a range of values, whereas categorical variables classify participants or outcomes into distinct groups.
In a fall-prevention project conducted in a veteran long-term care facility (Bangura, 2024), patient age represents a continuous demographic variable. Age can be measured numerically and summarized using descriptive statistics such as the mean and standard deviation. Continuous variables allow researchers to evaluate trends and variability within a population.
In contrast, fall occurrence (fall vs. no fall) represents a categorical variable because it places participants into mutually exclusive groups. Categorical variables are commonly summarized using counts and percentages, which allow researchers to determine the proportion of individuals experiencing a specific outcome. Recognizing whether a variable is continuous or categorical is important because the level of measurement determines which statistical methods are appropriate for analysis (Gray & Grove, 2020).
Descriptive Versus Inferential Statistics
Descriptive and inferential statistics serve different purposes in research. Descriptive statistics are used to organize and summarize data so that researchers can better understand the characteristics of a sample. Measures such as the mean, median, standard deviation, and frequency distributions are commonly used to present descriptive information (Salkind & Frey, 2025). For example, a fall-prevention project may report the mean age of participants or the total number of falls during a specific time period.
Inferential statistics, on the other hand, allow researchers to determine whether findings observed in a sample are likely to apply to a larger population. Statistical tests such as the t test, chi-square test, or analysis of variance (ANOVA) are commonly used for this purpose (Salkind & Frey, 2025). For instance, researchers may conduct a paired t test to determine whether fall rates significantly decreased after implementing an intervention such as intentional rounding. Inferential statistics rely on probability theory to evaluate whether observed differences are likely due to chance or reflect a meaningful effect.
Sample Size and the Risk of Type I and Type II Errors
Sample size is an important methodological factor because it influences the reliability of statistical findings. Larger sample sizes generally increase statistical power and reduce the likelihood of errors. In research studies, investigators often calculate sample size in advance to ensure that the study can detect meaningful differences between groups (Bullen, n.d.).
Research studies typically involve larger samples because their goal is to produce findings that can be generalized to broader populations. With larger samples, the probability of a Type II error, or failing to detect a real effect, is reduced.
In contrast, QI initiatives and DNP projects frequently use smaller samples because they are implemented within specific clinical settings. Although these projects aim to improve local practice rather than generate broadly generalizable findings, small samples may increase the likelihood of Type I errors (identifying an effect that does not actually exist) or Type II errors due to reduced statistical power (Bullen, n.d.). Careful planning of the sample size and statistical analysis helps ensure that conclusions drawn from these projects are meaningful.
The Standardized Infection Ratio (SIR)
The Standardized Infection Ratio
(SIR) is a metric used in healthcare to evaluate rates of healthcare-associated infections (HAIs). The SIR compares the number of infections that occur in a healthcare setting with the number predicted based on national surveillance data (Centers for Disease Control and Prevention [CDC], 2025).
The SIR is calculated by dividing the observed number of infections by the predicted number:
SIR = Observed infections ÷ Predicted infections
A value of 1.0 indicates that the infection rate is consistent with the national benchmark. Values greater than 1.0 suggest higher-than-expected infection rates, whereas values below 1.0 indicate fewer infections than predicted. The predicted infection counts are derived from national data collected through the National Healthcare Safety Network (NHSN) and adjusted for factors such as patient risk level, facility characteristics, and procedural complexity (CDC, 2025).
Healthcare organizations use SIR values to monitor infection control performance, compare outcomes with national benchmarks, and guide quality improvement initiatives aimed at reducing healthcare-associated infections.
Example of Descriptive and Inferential Statistics in a Study
In the fall-prevention DNP project described by Bangura (2024), descriptive statistics may be used to report the average fall rate per 1,000 patient days before implementation of intentional rounding. This statistic summarizes the baseline occurrence of falls in the facility.
An inferential statistic, such as a paired t test, may then be used to determine whether the fall rate changed significantly after the intervention was implemented. The inferential test allows researchers to assess whether the observed improvement is statistically significant rather than due to random variation (Salkind & Frey, 2025). Using both descriptive and inferential statistics provides a more comprehensive understanding of the intervention’s effectiveness.
In conclusion,
Statistical literacy is essential for interpreting research findings and applying evidence in clinical practice. Continuous variables such as age provide measurable numerical data that can be summarized using descriptive statistics, while categorical variables classify outcomes into groups. Descriptive statistics summarize the characteristics of a dataset, whereas inferential statistics allow researchers to test hypotheses and determine whether findings are statistically significant. Additionally, healthcare metrics such as the Standardized Infection Ratio provide organizations with a standardized approach to evaluating infection control performance. By understanding these statistical concepts, nurses and healthcare leaders can strengthen evidence-based decision-making and improve patient safety outcomes.
References
Bangura, F. (2024). Development and evaluation of a nurse practitioner-directed intentional rounding strategy and its impact on decreasing falls in a veteran’s long-term care facility (Doctoral dissertation, Wilmington University).
Bissett, K., Ascenzi, J., & Whalen, M. (2025). Johns Hopkins evidence-based practice for nurses and healthcare professionals: Model and guidelines (5th ed.). Sigma Theta Tau International.
Bullen, P. (n.d.). How to choose a sample size (for the statistically challenged). Tools4Dev.
[https://tools4dev.org/resources/how-to-choose-a-sample-size\
Links to an external site.](https://tools4dev.org/resources/how-to-choose-a-sample-size)
Centers for Disease Control and Prevention. (2025). NHSN’s guide to the 2022 baseline standardized infection ratios.
Gray, J. R., & Grove, S. K. (2020). Burns and Grove’s the practice of nursing research: Appraisal, synthesis, and generation of evidence (9th ed.). Elsevier.
Salkind, N. J., & Frey, B. B. (2025). Statistics for people who (think they) hate statistics (8th ed.). SAGE Publications.
Post 2:
The article selected is Beydoun et al. (2022) research study, which examined the relationship between perioperative topical antisepsis and surgical site infections (SSI) in patients undergoing reconstruction of the upper aerodigestive tract. The researchers identified continuous and categorical demographic variables in their study (Beydoun et al., 2022). One of the continuous variables reported in the research study is age. The researchers indicated that the median age was 64 years, and the age of the participants ranged between 21 and 95 years, among 554 participants enrolled in the study (Beydoun et al., 2022). Although age can be a discrete variable, the researcher used it as a continuous variable when they provided a range that represented the distribution of ages of participants included in the study. One categorical demographic variable reported in the study is sex. The researchers indicated that 66.2% of the participants were male and 33.8% were female (Beydoun et al., 2022). Categorical variables consist of grouped data represented in numeric measurements (Kaliyadan & Kulkarni, 2019).
Comparing Descriptive and Inferential Statistics
Descriptive statistics include statistical techniques used to summarize data (Kaliyadan & Kulkarni, 2019). In Beydoun et al.’s (2022) research study, the descriptive statistics were used to describe the sample characteristics. The statistical techniques used included median, rate, and percentages. The researchers used percentages to show the percentage of male participants (66.2%) and median to report the median age (Beydoun et al., 2022). The researchers used the rate when reporting the SSI rate (20.9%) (Beydoun et al., 2022). On the other hand, inferential statistics involves statistical tools used to test relationships between variables and draw conclusions. In Beydoun et al.’s (2022) research study, the researchers used logistic regression analysis and relative risk ratios to determine the relationship between perioperative topical antiseptics and SSI risk. For instance, systemic prophylaxis was associated with a reduced postoperative SSI risk (OR, 0.42; 95% CI, 0.21-0.84) (Beydoun et al., 2022).
Comparing Sample Sizes and Type I and II Errors
Among the three studies, Sood et al.’s (2022) QI study had the largest sample (2,875 patients), followed by Beydoun et al.'s (2022) research study (554 patients), while Sauer’s (2023) DNP EBP project had the smallest sample (50 patients). The large sample in the QI study reduces type II error by increasing the probability that the study will detect the true effect of the intervention. The research study has a smaller sample, which increases the risk of type II error, as the sample may not be sufficient to detect the effect of the intervention. The DNP project has the smallest sample size, which increases the risk of both type I and type II errors due to the limited statistical power (Serdar et al., 2021).
The Standardized Infection Ratio (SIR) Rate
The SIR rate is a quality measure used by the National Healthcare Safety Network (NHSN) to track infections that occur during hospitalization by comparing the infection count in one facility to the predicted infection count based on national data on the infection rate after risk adjustment (Meehan et al., 2025). The desired outcome is an SIR rate of less than 1, which indicates that a facility has fewer hospital-acquired infections than predicted. Organizations use the SIR rate to identify the need for QI initiatives to reduce infection rates. They can also use the SIR rate to determine the effectiveness of interventions implemented to control hospital-acquired infections.
Differentiate Between One Descriptive and One Inferential Statistic Used in the Articles
Beydoun et al. (2022) used median age as a descriptive statistic to describe the study population, indicating that the median age of the participants was 64 years. This statistical data describes the population without comparing the study variables. However, the researchers used logistic regression analysis as an inferential statistic to compare the study variables. This inferential statistic was used to evaluate the impact of preoperative topical antisepsis on SSIs (Beydoun et al., 2022). The logistic regression analysis showed that the intervention led to a reduction in SSI incidence in the facility (Beydoun et al., 2022).
References
Beydoun, A. S., Koss, K., Nielsen, T., Holcomb, A. J., Pichardo, P., Purdy, N., Zebolsky, A. L., Heaton, C. M., McMullen, C. P., Yesensky, J. A., Moore, M. G., Goyal, N., Kohan, J., Sajisevi, M., Tan, K., Petrisor, D., Wax, M. K., Kejner, A. E., Hassan, Z., … Zenga, J. (2022). Perioperative topical antisepsis and surgical site infection in patients undergoing upper aerodigestive tract reconstruction. JAMA Otolaryngology-Head & Neck Surgery, 148(6), 547–554. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9047735
Kaliyadan, F., & Kulkarni, V. (2019). Types of variables, descriptive statistics, and sample size. Indian dermatology online journal, 10(1), 82–86. https://doi.org/10.4103/idoj.IDOJ_468_18
Meehan, J. P., Giordani, M., Lum, Z. C., & Danielsen, B. H. (2025). An analysis of the standardized infection ratio in California from 2015 to 2019: A publicly reported, validated measure of hospital case-mix complexity and quality for surgical site infections in hip arthroplasty. The Journal of Arthroplasty, 40(3), 773-778. https://doi.org/10.1016/j.arth.2024.08.024
Sauer, K. (2023). Testing for the treatment of urinary tract infections in symptomatic adult patients residing in long-term care facility: An evidence-based quality improvement project. (Publication No. 30569808) [Doctoral dissertation, Phoenix University]. ProQuest Dissertations and Theses Global. https://www.proquest.com/dissertations-theses/point-care-testing-treatment-urinary-tract/docview/2875242069/se-2?accountid=14872
Serdar, C. C., Cihan, M., Yücel, D., & Serdar, M. A. (2021). Sample size, power and effect size revisited: Simplified and practical approaches in pre-clinical, clinical and laboratory studies. Biochemia Medica, 31(1), 010502. https://doi.org/10.11613/BM.2021.010502
Sood, N., Lee, R. E., To, J. K., Cervellione, K. L., Smilios, M. D., Chun, H., & Ngai, I. M. (2022). Decreased incidence of cesarean surgical site infection rate with hospital‐wide perioperative bundle. Birth: Issues in Perinatal Care, 49(1), 141–146.
[https://onlinelibrary.wiley.com/doi/abs/10.1111/birt.12586\
Links to an external site.](https://onlinelibrary.wiley.com/doi/abs/10.1111/birt.12586)
**## post12responses.docx**
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| CONTRIBUTION TO THE DISCUSSION: First Response (20 possible points) | **20 to >19.0 ptsExcellent** Discussion response: • Significantly contributes to the quality of the discussion/interaction and thinking and learning. • Provides rich and relevant examples and thought-provoking ideas that demonstrates new perspectives, and synthesis of ideas supported by the literature. • Scholarly sources are correctly cited and formatted. • First response is supported by 2 or more relevant examples and research/evidence from a variety of scholarly sources including course and outside readings. • Posts on separate day.<br> <br>**19 to >15.0 ptsGood** Discussion response: • Contributes to the quality of the interaction/discussion and learning. • Provides relevant examples and/or thought-provoking ideas • Scholarly sources are correctly cited and formatted. • First response is supported by 2 or more relevant examples and research/evidence from a variety of scholarly sources including course and outside readings. • Posts on separate day.<br> <br>**15 to >12.0 ptsFair** Discussion response: • Minimally contributes to the quality of the interaction/discussion and learning. • Provides few examples to support thoughts. • Information provided lacks evidence of critical thinking or synthesis of ideas. • There is a lack of support from relevant scholarly research/evidence. • Posts on separate day.<br> <br>**12 to >0 ptsPoor** Discussion response: • Does not contribute to the quality of the interaction/discussion and learning. • Lacks relevant examples or ideas. • There is a lack of support from relevant scholarly research/evidence. • Posts on same day. | 20 pts |
| This criterion is linked to a Learning OutcomeCONTRIBUTION TO THE DISCUSSION: Second Response (20 possible points) | **20 to >19.0 ptsExcellent** Discussion response: • Significantly contributes to the quality of the discussion/interaction and thinking and learning. • Provides relevant examples and thought-provoking ideas that demonstrates new perspectives, and extensive synthesis of ideas supported by the literature. • Second response is supported by 2 or more relevant examples and research/evidence from a variety of scholarly sources including course and outside readings. • Scholarly sources are correctly cited and formatted. • Posts on separate day.<br> <br>**19 to >15.0 ptsGood** Discussion response: • Contributes to the quality of the interaction/discussion and learning. • Provides relevant examples and/or thought-provoking ideas • Second response is supported by 2 or more relevant examples and research/evidence from a variety of scholarly sources including course and outside readings. • Scholarly sources are correctly cited and formatted. • Posts on separate day.<br> <br>**15 to >12.0 ptsFair** Discussion response: • Minimally contributes to the quality of the interaction/discussion and learning. • Provides few examples to support thoughts. • Information provided lacks evidence of critical thinking or synthesis of ideas. • Minimal scholarly sources provided to support post. • Posts on separate day.<br> <br>**12 to >0 ptsPoor** Discussion response: • Does not contribute to the quality of the interaction/discussion and learning. • Lacks relevant examples or ideas. • No sources provided. • Posts on same day. | 20 pts |
| This criterion is linked to a Learning OutcomeQUALITY OF WRITING (10 possible points) | **10 to >9.0 ptsExcellent** Discussion postings and responses exceed doctoral level writing expectations: • Use Standard Academic English that is clear, concise, and appropriate to doctoral level writing. • Make few if any errors in spelling, grammar, that does not affect clear communication. • Uses correct APA 7 format as closely as possible given the constraints of the online platform. • Are positive, courteous, and respectful when offering suggestions, constructive feedback, or opposing viewpoints.<br> <br>**9 to >8.0 ptsGood** Discussion postings and responses meet doctoral level writing expectations: • Use Standard Academic English that is clear and appropriate to doctoral level writing • Makes a few errors in spelling, grammar, that does not affect clear communication. • Uses correct APA 7 format as closely as possible given the constraints of the online platform. • Are courteous and respectful when offering suggestions, constructive feedback, or opposing viewpoints.<br> <br>**8 to >6.0 ptsFair** Discussion postings and responses are somewhat below doctoral level writing expectations: • Posts contains multiple spelling, grammar, and/or punctuation deviations from Standard Academic English that affect clear communication. • Numerous errors in APA 7 format • May be less than courteous and respectful when offering suggestions, feedback, or opposing viewpoints.<br> <br>**6 to >0 ptsPoor** Discussion postings and responses are well below doctoral level writing expectations: • Posts contains multiple spelling, grammar, and/or punctuation deviations from Standard Academic English that affect clear communication. • Uses incorrect APA 7 format • Are discourteous and disrespectful when offering suggestions, feedback, or opposing viewpoints. | |
Read a selection of your classmates’ posts and respond to at least two of your classmates on two different days by expanding upon their reflections, making connections to your perceptions, and offering additional insights.
Note: Your responses to classmates should be substantial supported with scholarly evidence from your research and/or the Learning Resources, and properly cited using APA Style. Personal anecdotes are acceptable as part of a meaningful response, but cannot stand alone as a response. Your responses should enrich the initial post by supporting and/or offering a fresh viewpoint, and be constructive, thereby enhancing the learning experience for all students.
**Post 1:**
Levels of Measurement, Statistical Comparisons, and the Standardized Infection Ratio
A clear understanding of levels of measurement and statistical methods is essential when evaluating nursing research, quality improvement (QI) initiatives, and evidence-based practice (EBP) projects. Correctly identifying variables and statistical approaches allows researchers and clinicians to interpret data accurately and apply findings to improve patient outcomes.
Continuous and Categorical Variables
Variables in research are categorized according to their level of measurement, which determines how they can be analyzed statistically (Gray & Grove, 2020). Continuous variables represent numerical measurements that can take a range of values, whereas categorical variables classify participants or outcomes into distinct groups.
In a fall-prevention project conducted in a veteran long-term care facility (Bangura, 2024), patient age represents a continuous demographic variable. Age can be measured numerically and summarized using descriptive statistics such as the mean and standard deviation. Continuous variables allow researchers to evaluate trends and variability within a population.
In contrast, fall occurrence (fall vs. no fall) represents a categorical variable because it places participants into mutually exclusive groups. Categorical variables are commonly summarized using counts and percentages, which allow researchers to determine the proportion of individuals experiencing a specific outcome. Recognizing whether a variable is continuous or categorical is important because the level of measurement determines which statistical methods are appropriate for analysis (Gray & Grove, 2020).
Descriptive Versus Inferential Statistics
Descriptive and inferential statistics serve different purposes in research. Descriptive statistics are used to organize and summarize data so that researchers can better understand the characteristics of a sample. Measures such as the mean, median, standard deviation, and frequency distributions are commonly used to present descriptive information (Salkind & Frey, 2025). For example, a fall-prevention project may report the mean age of participants or the total number of falls during a specific time period.
Inferential statistics, on the other hand, allow researchers to determine whether findings observed in a sample are likely to apply to a larger population. Statistical tests such as the t test, chi-square test, or analysis of variance (ANOVA) are commonly used for this purpose (Salkind & Frey, 2025). For instance, researchers may conduct a paired t test to determine whether fall rates significantly decreased after implementing an intervention such as intentional rounding. Inferential statistics rely on probability theory to evaluate whether observed differences are likely due to chance or reflect a meaningful effect.
Sample Size and the Risk of Type I and Type II Errors
Sample size is an important methodological factor because it influences the reliability of statistical findings. Larger sample sizes generally increase statistical power and reduce the likelihood of errors. In research studies, investigators often calculate sample size in advance to ensure that the study can detect meaningful differences between groups (Bullen, n.d.).
Research studies typically involve larger samples because their goal is to produce findings that can be generalized to broader populations. With larger samples, the probability of a Type II error, or failing to detect a real effect, is reduced.
In contrast, QI initiatives and DNP projects frequently use smaller samples because they are implemented within specific clinical settings. Although these projects aim to improve local practice rather than generate broadly generalizable findings, small samples may increase the likelihood of Type I errors (identifying an effect that does not actually exist) or Type II errors due to reduced statistical power (Bullen, n.d.). Careful planning of the sample size and statistical analysis helps ensure that conclusions drawn from these projects are meaningful.
The Standardized Infection Ratio (SIR)
The Standardized Infection Ratio
(SIR) is a metric used in healthcare to evaluate rates of healthcare-associated infections (HAIs). The SIR compares the number of infections that occur in a healthcare setting with the number predicted based on national surveillance data (Centers for Disease Control and Prevention [CDC], 2025).
The SIR is calculated by dividing the observed number of infections by the predicted number:
SIR = Observed infections ÷ Predicted infections
A value of 1.0 indicates that the infection rate is consistent with the national benchmark. Values greater than 1.0 suggest higher-than-expected infection rates, whereas values below 1.0 indicate fewer infections than predicted. The predicted infection counts are derived from national data collected through the National Healthcare Safety Network (NHSN) and adjusted for factors such as patient risk level, facility characteristics, and procedural complexity (CDC, 2025).
Healthcare organizations use SIR values to monitor infection control performance, compare outcomes with national benchmarks, and guide quality improvement initiatives aimed at reducing healthcare-associated infections.
Example of Descriptive and Inferential Statistics in a Study
In the fall-prevention DNP project described by Bangura (2024), descriptive statistics may be used to report the average fall rate per 1,000 patient days before implementation of intentional rounding. This statistic summarizes the baseline occurrence of falls in the facility.
An inferential statistic, such as a paired t test, may then be used to determine whether the fall rate changed significantly after the intervention was implemented. The inferential test allows researchers to assess whether the observed improvement is statistically significant rather than due to random variation (Salkind & Frey, 2025). Using both descriptive and inferential statistics provides a more comprehensive understanding of the intervention’s effectiveness.
In conclusion,
Statistical literacy is essential for interpreting research findings and applying evidence in clinical practice. Continuous variables such as age provide measurable numerical data that can be summarized using descriptive statistics, while categorical variables classify outcomes into groups. Descriptive statistics summarize the characteristics of a dataset, whereas inferential statistics allow researchers to test hypotheses and determine whether findings are statistically significant. Additionally, healthcare metrics such as the Standardized Infection Ratio provide organizations with a standardized approach to evaluating infection control performance. By understanding these statistical concepts, nurses and healthcare leaders can strengthen evidence-based decision-making and improve patient safety outcomes.
References
Bangura, F. (2024). Development and evaluation of a nurse practitioner-directed intentional rounding strategy and its impact on decreasing falls in a veteran’s long-term care facility (Doctoral dissertation, Wilmington University).
Bissett, K., Ascenzi, J., & Whalen, M. (2025). Johns Hopkins evidence-based practice for nurses and healthcare professionals: Model and guidelines (5th ed.). Sigma Theta Tau International.
Bullen, P. (n.d.). How to choose a sample size (for the statistically challenged). Tools4Dev.
[https://tools4dev.org/resources/how-to-choose-a-sample-size\
Links to an external site.](https://tools4dev.org/resources/how-to-choose-a-sample-size)
Centers for Disease Control and Prevention. (2025). NHSN’s guide to the 2022 baseline standardized infection ratios.
Gray, J. R., & Grove, S. K. (2020). Burns and Grove’s the practice of nursing research: Appraisal, synthesis, and generation of evidence (9th ed.). Elsevier.
Salkind, N. J., & Frey, B. B. (2025). Statistics for people who (think they) hate statistics (8th ed.). SAGE Publications.
Post 2:
The article selected is Beydoun et al. (2022) research study, which examined the relationship between perioperative topical antisepsis and surgical site infections (SSI) in patients undergoing reconstruction of the upper aerodigestive tract. The researchers identified continuous and categorical demographic variables in their study (Beydoun et al., 2022). One of the continuous variables reported in the research study is age. The researchers indicated that the median age was 64 years, and the age of the participants ranged between 21 and 95 years, among 554 participants enrolled in the study (Beydoun et al., 2022). Although age can be a discrete variable, the researcher used it as a continuous variable when they provided a range that represented the distribution of ages of participants included in the study. One categorical demographic variable reported in the study is sex. The researchers indicated that 66.2% of the participants were male and 33.8% were female (Beydoun et al., 2022). Categorical variables consist of grouped data represented in numeric measurements (Kaliyadan & Kulkarni, 2019).
Comparing Descriptive and Inferential Statistics
Descriptive statistics include statistical techniques used to summarize data (Kaliyadan & Kulkarni, 2019). In Beydoun et al.’s (2022) research study, the descriptive statistics were used to describe the sample characteristics. The statistical techniques used included median, rate, and percentages. The researchers used percentages to show the percentage of male participants (66.2%) and median to report the median age (Beydoun et al., 2022). The researchers used the rate when reporting the SSI rate (20.9%) (Beydoun et al., 2022). On the other hand, inferential statistics involves statistical tools used to test relationships between variables and draw conclusions. In Beydoun et al.’s (2022) research study, the researchers used logistic regression analysis and relative risk ratios to determine the relationship between perioperative topical antiseptics and SSI risk. For instance, systemic prophylaxis was associated with a reduced postoperative SSI risk (OR, 0.42; 95% CI, 0.21-0.84) (Beydoun et al., 2022).
Comparing Sample Sizes and Type I and II Errors
Among the three studies, Sood et al.’s (2022) QI study had the largest sample (2,875 patients), followed by Beydoun et al.'s (2022) research study (554 patients), while Sauer’s (2023) DNP EBP project had the smallest sample (50 patients). The large sample in the QI study reduces type II error by increasing the probability that the study will detect the true effect of the intervention. The research study has a smaller sample, which increases the risk of type II error, as the sample may not be sufficient to detect the effect of the intervention. The DNP project has the smallest sample size, which increases the risk of both type I and type II errors due to the limited statistical power (Serdar et al., 2021).
The Standardized Infection Ratio (SIR) Rate
The SIR rate is a quality measure used by the National Healthcare Safety Network (NHSN) to track infections that occur during hospitalization by comparing the infection count in one facility to the predicted infection count based on national data on the infection rate after risk adjustment (Meehan et al., 2025). The desired outcome is an SIR rate of less than 1, which indicates that a facility has fewer hospital-acquired infections than predicted. Organizations use the SIR rate to identify the need for QI initiatives to reduce infection rates. They can also use the SIR rate to determine the effectiveness of interventions implemented to control hospital-acquired infections.
Differentiate Between One Descriptive and One Inferential Statistic Used in the Articles
Beydoun et al. (2022) used median age as a descriptive statistic to describe the study population, indicating that the median age of the participants was 64 years. This statistical data describes the population without comparing the study variables. However, the researchers used logistic regression analysis as an inferential statistic to compare the study variables. This inferential statistic was used to evaluate the impact of preoperative topical antisepsis on SSIs (Beydoun et al., 2022). The logistic regression analysis showed that the intervention led to a reduction in SSI incidence in the facility (Beydoun et al., 2022).
References
Beydoun, A. S., Koss, K., Nielsen, T., Holcomb, A. J., Pichardo, P., Purdy, N., Zebolsky, A. L., Heaton, C. M., McMullen, C. P., Yesensky, J. A., Moore, M. G., Goyal, N., Kohan, J., Sajisevi, M., Tan, K., Petrisor, D., Wax, M. K., Kejner, A. E., Hassan, Z., … Zenga, J. (2022). Perioperative topical antisepsis and surgical site infection in patients undergoing upper aerodigestive tract reconstruction. JAMA Otolaryngology-Head & Neck Surgery, 148(6), 547–554. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9047735
Kaliyadan, F., & Kulkarni, V. (2019). Types of variables, descriptive statistics, and sample size. Indian dermatology online journal, 10(1), 82–86. https://doi.org/10.4103/idoj.IDOJ_468_18
Meehan, J. P., Giordani, M., Lum, Z. C., & Danielsen, B. H. (2025). An analysis of the standardized infection ratio in California from 2015 to 2019: A publicly reported, validated measure of hospital case-mix complexity and quality for surgical site infections in hip arthroplasty. The Journal of Arthroplasty, 40(3), 773-778. https://doi.org/10.1016/j.arth.2024.08.024
Sauer, K. (2023). Testing for the treatment of urinary tract infections in symptomatic adult patients residing in long-term care facility: An evidence-based quality improvement project. (Publication No. 30569808) [Doctoral dissertation, Phoenix University]. ProQuest Dissertations and Theses Global. https://www.proquest.com/dissertations-theses/point-care-testing-treatment-urinary-tract/docview/2875242069/se-2?accountid=14872
Serdar, C. C., Cihan, M., Yücel, D., & Serdar, M. A. (2021). Sample size, power and effect size revisited: Simplified and practical approaches in pre-clinical, clinical and laboratory studies. Biochemia Medica, 31(1), 010502. https://doi.org/10.11613/BM.2021.010502
Sood, N., Lee, R. E., To, J. K., Cervellione, K. L., Smilios, M. D., Chun, H., & Ngai, I. M. (2022). Decreased incidence of cesarean surgical site infection rate with hospital‐wide perioperative bundle. Birth: Issues in Perinatal Care, 49(1), 141–146.
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