In preparation for a study of the effectiveness of an antipsychotic drug, an assistant puts all drugs into capsules of the same color and codes them. The assistant will have no part in administering the drug. Neither the subjects nor the experimenter will know who receives which drug. This is an example of a:

Question

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This is an example of a double-masked design, also known as a double-blind study, where neither the participants (subjects) nor the experimenters know who is receiving the active treatment versus a placebo, eliminating bias from both parties.

In Preparation for a Study of the Effectiveness of an Antipsychotic