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A researcher wished to study the effect of a new drug on symptoms of depression. Research participants were randomly assigned to two groups. Participants in Group A received the drug whenever they reported depressive symptoms to the experimenter; participants in Group B received nothing when they reported depressive symptoms to the experimenter. After a month of this procedure, participants in Group A reported significantly fewer symptoms of depression.
-A serious flaw of this study was that it:

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The serious flaw of this study is that it was not a double-blind design. In a double-blind design, both the participants and the experimenter are unaware of who is receiving the drug or placebo, which helps to eliminate bias and increase the reliability of the results. However, in this study, participants in Group A knew they were receiving the drug whenever they reported symptoms, which could potentially influence their reports of symptoms and skew the results.

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