Reference no: EM13576226

Question: A researcher is interested in comparing the effectiveness of three different kinds of therapy for anger problems. Eight participants are randomly assigned to three treatment conditions: Cognitive Therapy (CT), Cognitive-Behavioral Therapy (CBT), and Interpersonal Therapy (IT). All participants complete the weekly treatment for 8 weeks. Participants take an anger test before and after the 8-week treatments. Each participant's difference score (= anger score after the treatment minus (-) anger score before the treatment) is shown in the following table. The three therapists in this experiment have equal educational levels and clinical experiences.    

CT	CBT	IT
3	5	7
4	4	8
4	6	9
4	6	10
3	5	6
8	4	7
6	9	11
2	7	10

a. What statistical test should be used to analyze the data?

b. Identify H₀ and H_a for this study.

c. Conduct the appropriate analysis.

d. Should H₀ be rejected? What should the researcher conclude?