A Clinical Psychologist Is Interested in Comparing the Effectiveness of Short

question 153

Multiple Choice

A clinical psychologist is interested in comparing the effectiveness of short term relaxation and cognitive-behavioral therapy in treating mild depression. An experiment is conducted in which 15 patients with mild depression are randomly selected and assigned 5 each to a relaxation therapy group, a cognitive/behavioral therapy group, and an attention placebo group. Therapy is administered until the patient is judged no longer depressed or until 10 treatment sessions have elapsed. The following data is obtained. Scores are the number of sessions for each patient. Using a = 0.05, what do you conclude?

• A) reject H 0 ; there is no difference among the treatments
• B) reject H 0 ; at least one of the treatments differs from at least one of the others
• C) retain H 0 ; we cannot conclude that there is a difference among the treatments
• D) accept H 0 ; we cannot conclude that there is a difference among the treatments

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