A health psychologist is interested on the effect of meditat

A health psychologist is interested on the effect of meditation on stress reduction. He recruits 50 participants ranging in age from 21-45 (M = 25, SD = 3.22) who are scheduled to begin a meditation class in the fall. Each participant is asked to fill out the Stress Scale one week before the class begins. This measure contains a total of 20 questions and is designed to assess a person

D. Related samples t-test