# A clinical psychologist is interested in comparing the effectiveness

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: 5, 6, 8, 4, 7
Relaxation Therapy: 6, 8, 10, 9, 7
Attention-Placebo Therapy Group: 8, 10, 9, 10, 9

Refer to Exhibit 15-2. Fobt = ____.
a. 10.21
b. 8.44
c. 8.20
d. 6.88

Refer to Exhibit 15-2. Using a = 0.05, Fcrit = ____.
a. 3.98
b. 19.41
c. 6.93
d. 3.88

Refer to Exhibit 15-2. Using a = 0.05, what do you conclude?
a. reject H0; there is no difference among the treatments
b. reject H0; at least one of the treatments differs from at least one of the others
c. retain H0; we cannot conclude that there is a difference among the treatments
d. accept H0; we cannot conclude that there is a difference among the treatments

Refer to Exhibit 15-2. Estimate the size of the effect ^w^2 = ____.
a. 0.5226
b. 0.4824
c. 0.4393
d. 0.4658

The one-way ANOVA partitions the total variability into ____.
a. SSW and SSB
b. sW 2 and sB 2
c. SSW and SST
d. SSB and sB 2

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