For these questions answer the questions posed You do not ne

For these questions, answer the questions posed. You do not necessarily have to do the inferential tests. Be sure that the answer you provide addresses the question asked. 1) As a psychologist, you are interested in studying patients\' response to cognitive-behavioral therapy as a treatment for their depression. You administer the Beck Depression Inventory to 25 individuals at the weekly group meeting. You re-administer the inventory one month later. At the beginning of the study, the average depression score was 18.6 (with a variance of 4.51). After 1 month of therapy, the average score was 16.2 (with a variance of 6.4). a. The best inferential test for this study (if you wanted to know if the therapy was effective based on statistical analysis) would be b. Assume that you did this computation and got a result of 1.53, write your findings below (What is the critical value and is it significant or not significant?).

Solution

a. we can use the unpaired t-test for analysis in this case.

b. the critical value is 2.01 with degrees of freedom 48(approximately 50) and alpha= 0.05. since the calculated alue 1.53 lies between the acceptence region(ie, -2.01<1.53< 2.01) ,it is not significant.