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 between = _________.
Definitions:
Obesity Rates
The percentage of a population that is classified as obese, based on measures such as Body Mass Index (BMI).
Social Classes
Categories of people within a society who share similar socioeconomic statuses.
M&Ms
A brand of candy-coated chocolate pieces that come in various colors.
Colors
The property possessed by an object of producing different sensations on the eye as a result of the way it reflects or emits light.
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