In a research study, a psychiatrist gives depressed patients a particular drug and observes that their symptoms diminish. He concludes that the drug caused the reduction in symptoms. This experiment is flawed because it lacks a(n) ________.

Question

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The experiment is flawed because it lacks a control group which is necessary to compare the effects of the drug to a group that did not receive it. Without a control group, it is impossible to determine whether the reduction in symptoms is due to the drug or some other factor.

In a Research Study, a Psychiatrist Gives Depressed Patients a Particular