Answer to Question #189829 in Psychology for wannabe

Question

1.   A clinical psychologist is interested in evaluating the effectiveness of the following three techniques for evaluating mild depression: cognitive restructuring, assertiveness training, and an exercise/nutrition program. Forty undergraduate students suffering from mild depression are randomly sampled from the university counseling center waiting list and randomly assigned ten each to the three techniques previously mentioned, and the remaining ten to placebo control group. Treatment is conducted for 10 weeks, after which depression is measured using Beck Depression Inventory (BDI). The treatment depression scores are given here. Higher scores indicate greater depression.

Answer 1

A. Null Hypothesis: The three techniques for evaluating mild depression are equally effective in treatment.

Alternative Hypothesis: The three techniques for eveluating mild depression are not equally effective in treatment.

B. P>0.05 is a probability that the null hypothesis is true. In this no significant effect was observed.

C. Interaction between the types of treatment is mutually significant.