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3 June, 08:12

As an element of an experiment to test the effectiveness of a drug for depression, one group of participants receives a pill that does not contain any active ingredients. The inclusion of these participants most directly indicates that the experiment involves:

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  1. 3 June, 09:53
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    The inclusion of these participants most directly indicates that the experiment involves a control group, and an active drug that they need to compare the results to.
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