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In an experiment designed to study the effectiveness of a new drug for treating diabetes, research participants who receive a placebo have been assigned to the ________ group.

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Answer:

The correct answer is "control".

Explanation:

The control group of a clinical trail is a group of individuals that unknowingly are receiving a substance that have no therapeutic effect (placebo), instead of receiving the treatment. Control groups serve to determine the effectiveness of the drug and to monitor the psychological effect of receiving a substance with no therapeutic effect.

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