If all of the participants in a repeated-measures study show roughly the same 10-point difference between treatments,then the data are likely to produce a significant value for the t statistic.

Question

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If all participants show roughly the same difference between treatments, then the variability within the data will be small, which increases the chance of obtaining a significant t-statistic. This is because a small variability (or smaller within-subjects variation) makes it easier to identify any significant differences between the treatments.

If All of the Participants in a Repeated-Measures Study Show