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-blind design because both the subjects and the experimenter are blinded to which drug is being administered. The coding of the drugs and the use of identical capsules with the same color ensure that there is no possibility of bias or influence in the administration of the drug.

In Preparation for a Study of the Effectiveness of an Antipsychotic