The double-blind procedure is most likely to be used in evaluating the effectiveness of

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The double-blind procedure is commonly used in evaluating the effectiveness of drug therapies. In this procedure, neither the participant nor the experimenter knows whether they are receiving the active drug or a placebo, which allows for unbiased measurement of the drug's effects. The other therapy types listed (cognitive, behavior, humanistic) are typically more focused on talk therapy interventions and would not involve drug administration, making them less likely to utilize a double-blind procedure.

The Double-Blind Procedure Is Most Likely to Be Used in Evaluating