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A clinical researcher is analyzing a study in which participants with generalized anxiety disorder were randomly assigned to either a new mindfulness-based therapy or a condition in which participants received an inert, inactive procedure but were told it was a genuine therapeutic technique. After eight weeks, the mindfulness group showed significantly greater symptom reduction. This design element is essential for establishing empirically supported treatment status because it separates the therapy's specific therapeutic mechanism from improvements caused by patients' belief that they are receiving real help — thereby ruling out the _____ effect as an explanation for the observed gains.

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Updated 2026-05-26

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Research Methods in Psychology - 4th American Edition @ KPU

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