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A clinical psychologist is interested in comparing the effectiveness of short term relaxation and cognitive-behavioral therapy...

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.

Cognitive/Behavioral

Therapy

Relaxation
Therapy

Attention-Placebo
Group

5
6
6
4
7

6
8
7
9
7

5
8
9
7
6

a) Calculate

b) Calculate

c) What are the degrees of freedom for the numerator?

d) What are the degrees of freedom for the denominator?

Math   Statistics-And-Probability   
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