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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.
-In this study, Group A was the:

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Group A is the group that received the drug and therefore experienced a change in the independent variable. This fits the definition of an experimental group. Group B, on the other hand, did not receive any treatment and therefore was the control group. The correlational group and cross-sectional group are not applicable to this study.

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