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In a study of 200 people, 100 are assigned to a treatment group and 100 to a control group. The treatment group receives a pill, and the control group receives a placebo. What is the role of the placebo group?
In a study of 200 people, 100 are assigned to a treatment group and 100 to a control group. The treatment group receives a pill, and the control group receives a placebo. What is the role of the placebo group?