Question

use first chart to answer questions 18-20

D Question 18 5 pts Suppose 20 hypertensive patients are assigned at random to each of four therapy groups, and the change of in diastolic blood pressure (DBP) is noted in these patients after a 1-month period. We want to see whether there is any difference in mean changes in DBP among the therapy groups. The results are given in the following table (please use this table to answer questions 18 through 20): Group 1 2 3 4 Mean Change in DBP 8.6 5.3 4.9 1.1 s.d. change 6.2 5.4 7.0 6.5 n 20 20 20 20 Also the result of ANOVA analysis is shown below (please use this result to answer questions 18 through 20): ANOVA Table

Answer 1

The correct Null hypothesis is:

H0: Mean changes among the four groups are same

Answer 19:

Given the collected data there is a 0.4% chance that the null hypothesis is correct.

Answer 20:

Mean changes of all four groups are different with a = 0.01

Reason:

Since from above output P value=0.0043<alpha(0.01)

Reject the null hypothesis and conclude that the alternate hypothesis is true that is H1: Mean changes among the four groups are different