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A graduate student compares two studies evaluating the same cognitive-behavioral therapy program: Study A randomly assigned participants to treatment or control conditions, while Study B used a pre-existing group of patients receiving the therapy alongside a comparable group who were not. When analyzing why Study B is classified as quasi-experimental rather than a true experiment, the student correctly identifies that the absence of _____ is the defining methodological distinction between the two designs.

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Updated 2026-05-25

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Research Methods in Psychology - 4th American Edition @ KPU

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