stat homework

1. Suppose an experimental investigation was undertaken in which 15 patients with hypertension were treated with an antihypertensive drug. Diastolic blood pressure (in mm Hg) was carefully measured under resting conditions before therapy (pretreatment), and then after six weeks of therapy (treatment). The data are presented below.

Patient      Pretreatment     Treatment

1                           1 06                            96

2                       105                             92

3                        96                               90

4                      113                              91

5                     112                             114

6                   122                             103

7                    98                                 81

8                  101                            105           

9                  115                             95

10              107                             89

11                 99                               102

12                  109                          84

13                  112                         91

14                104                          88

15                100                          85

a) Conduct a paired t-test on the data using SPSS. You should read Chapter 7 of “A Crash Course in SPSS,” if you need help. Was the treatment effective in reducing hypertension (i.e., blood pressure)? Properly report the results of the t-test to support your answer. Be sure to print out and turn in a copy of your summary results. 3 pts

b) Conduct a Wilcoxon Matched-Pairs Test on the same set of data. You may want to read Chapter 8 of a “Crash Course in SPSS.” Was the treatment effective? How does the level of significance here compare to that found in (a)? Why does the significance level differ? Be sure to print out and turn in a copy of your SPSS summary results. 3 pts