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Calculating t-tests for Independent Samples and Calculating t-tests for Paired (Dependent) Samples (Example)

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Nursing Statistics Exercise 31&32 Students Name Institution Affiliation Answers to questions Exercise 31 Question one The example data met the assumptions of the independent t test. This is because the data were normally distributed. . The two samples or groups also had equal variances and all observations for each group were independent because the groups were assigned as either treatment or control groups (Rice et al. 2014). Question Two The Shappiro wilk statistic is 0.194 Tests of Normality Kolmogorov-SmirnovaShapiro-WilkStatistic DfSig. Statistic dfSig. Weekly Wages Earned .155 20 .200* .935 20 .194 *. This is a lower bound of the true significance. a. Lilliefors Significance Correction Question Three For group 1 which is the intervention group the mean for wages is $232.7 while for the control group(2) is $128.40 Group Statistics Group N Mean Std. effective distress from baseline to post treatment t=2.865 p=0.019; Mean=3.03 versus 2.40 respectively. Thus the particular type of treatment approach implemented to reduce the emotional distress of patients was effective as represented by decreasing emotional distress Question Nine The results show that the rehabilitation on emotional distress was successful and effective in reducing the emotional distress for the patients. This is as witnessed by the reduction in emotional distress levels post treatment. Question Ten The weakness of the design is that we cannot be certain that the intervention caused the reduction in emotional distress levels. It might also be due to use of other treatments during the time elapsed from baseline to post treatment. Reference De Winter J. C. (2013). Using the Student's t-test with extremely small sample sizes. Practical Assessment Research & Evaluation 18(10). [...]

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Use MS Word to complete "Questions to be Graded: Exercises 31 and 32" in Statistics for Nursing Research: A Workbook for Evidence-Based Practice. Submit your work in SPSS by copying the output and pasting into the Word document. In addition to the SPSS output, please include explanations of the results where appropriate. EXERCISE 31 Questions to Be Graded Name: _______________________________________________________ Class: _____________________ Date: ___________________________________________________________________________________ Follow your instructor's directions to submit your answers to the following questions for grading. Your instructor may ask you to write your answers below and submit them as a hard copy for grading. Alternatively, your instructor may ask you to use the space below for notes and submit your answers online at evolve.elsevier.com under “Questions to Be Graded.” 1. Do the example data meet the assumptions for the independent samples t-test? Provide a rationale for your answer. 2. If calculating by hand, draw the frequency distributions of the dependent variable, wages earned. What is the shape of the distribution? If using SPSS, what is the result of the Shapiro-Wilk test of normality for the dependent variable? 3. What are the means for two group's wages earned? 4. What is the independent samples t-test value? 362 5. Is the t-test significant at a = 0.05? Specify how you arrived at your answer. 6. If using SPSS, what is the exact likelihood of obtaining a t-test value at least as extreme or as close to the one that was actually observed, assuming that the null hypothesis is true? 7. Which group earned the most money post-treatment? 8. Write your interpretation of the results as you would in an APA-formatted journal. 9. What do the results indicate regarding the impact of the supported employment vocational rehabilitation on wages earned? 10. Was the sample size adequate to detect significant differences between the two groups in this example? Provide a rationale for your answer. EXERCISE 32 Questions to be Graded Name: _______________________________________________________ Class: _____________________ Date: ___________________________________________________________________________________ Follow your instructor's directions to submit your answers to the following questions for grading. Your instructor may ask you to write your answers below and submit them as a hard copy for grading. Alternatively, your instructor may ask you to use the space below for notes and submit your answers online at evolve.elsevier.com under “Questions to Be Graded.” 1. Do the example data meet the assumptions for the paired samples t-test? Provide a rationale for your answer. 2. If calculating by hand, draw the frequency distributions of the two variables. What are the shapes of the distributions? If using SPSS, what are the results of the Shapiro-Wilk tests of normality for the two variables? 3. What are the means for the baseline and posttreatment affective distress scores, respectively? 4. What is the paired samples t-test value? 376 5. Is the t-test significant at α = 0.05? Specify how you arrived at your answer. 6. If using SPSS, what is the exact likelihood of obtaining a t-test value at least as extreme as or as close to the one that was actually observed, assuming that the null hypothesis is true? 7. On average, did the affective distress scores improve or deteriorate over time? Provide a rationale for your answer. 8. Write your interpretation of the results as you would in an APA-formatted journal. 9. What do the results indicate regarding the impact of the rehabilitation on emotional distress levels? 10. What are the weaknesses of the design in this example?

Subject Area: Statistics

Document Type: Paraphrasing

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Price $15

Words 550

Pages 2

Completed in 23 days

Expert AcademiaFreelance

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Excellent writer, the best in Statistics, I recommend him 100 %.

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10.13.2017

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