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Questions to be Graded: Exercise 26" in Statistics for Nursing Research:
Questions to Be Graded
EXERCISE 26
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 http://evolve.elsevier.com/Grove/Statistics/ under “Questions to Be Graded.”
1. Plot the frequency distribution for “Age at Enrollment” by hand or by using SPSS. 2.
How would you characterize the Skewness of the distribution in Question 1—positively skewed, negatively skewed, or approximately normal? Provide a rationale for your answer.
3. Compare the original Skewness statistic and ShapiroWilk statistic with those of the smaller dataset (n = 15) for the variable “Age at First Arrest.” How did the statistics change, and how would you explain these differences?
4. Plot the frequency distribution for “Years of Education” by hand or by using SPSS.
5. How would you characterize the kurtosis of the distribution in Question 4—leptokurtic, mesokurtic, or platykurtic? Provide a rationale for your answer.
6. What is the Skewness statistic for “Age at Enrollment”? How would you characterize the magnitude of the Skewness statistic for “Age at Enrollment”?
7. What is the kurtosis statistic for “Years of Education”? How would you characterize the magnitude of the kurtosis statistic for “Years of Education”?
8. Using SPSS, compute the ShapiroWilk statistic for “Number of Times Fired from Job.” What would you conclude from the results?
9. In the SPSS output table titled “Tests of Normality,” the ShapiroWilk statistic is reported along with the KolmogorovSmirnov statistic. Why is the KolmogorovSmirnov statistic inappropriate to report for these example data?
10. How would you explain the Skewness statistic for a particular frequency distribution being low and the ShapiroWilk statistic still being signiﬁcant at p < 0.05?
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