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. 
Estimate the size of the effect. ç 2 = _________.
Definitions:
Categorical Approach
A method of classification based on discrete, distinct categories or groups.
Dimensional Approach
A method of understanding or categorizing phenomena on a continuum rather than as binary opposites or in discrete categories.
Maladaptiveness
A characteristic of certain behaviors or traits that are counterproductive or ineffective in achieving desired outcomes in a given context.
95th Percentile
A statistical measure indicating that 95% of the data points fall below this value, often used to identify outliers or set benchmarks in various fields.
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