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A psychology researcher employs a pretest-posttest design with switching replication to evaluate a memory-enhancement technique. While the first group demonstrates significant improvement after the intervention, the second group shows no such change when the intervention is introduced to them later. When evaluating the internal validity of the study, the researcher must conclude that the initial results in the first group were likely _____, as the effect failed to replicate under the staggered introduction.

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Updated 2026-05-26

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Research Methods in Psychology - 4th American Edition @ KPU

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