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.
SS within = _________.
The value of SS within is obtained below:
Introduction to one-way ANOVA:
One-way ANOVA is a statistical method for testing hypotheses regarding the mean difference among two or more independent populations or treatments.
Step- by-step procedure to obtain SS within using Minitab software as follows:
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