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. 
SSwithin = _________.
Definitions:
Alkenes
Unsaturated hydrocarbons containing one or more double bonds, which influence their chemical reactions and properties.
Hydrogenation
The chemical process of adding hydrogen to an organic compound, often to reduce double or triple bonds to single bonds.
Molecular Formula
A representation of the number and type of atoms in a molecule, without indicating how the atoms are bonded or arranged.
Natural Product
A chemical compound or substance produced by a living organism, found in nature.
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