In a between-subjects design,large individual differences can lead to

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Large individual differences can lead to large variance within treatments in a between-subjects design, as each participant is assigned to only one treatment group, and their individual differences are not controlled or balanced across groups. This can result in a wider range of scores and more variability within each treatment group, which can make it more difficult to detect small treatment effects or to draw firm conclusions about the efficacy of the treatment.

In a Between-Subjects Design,large Individual Differences Can Lead to