A repeated-measures study uses a sample of n = 10 participants to evaluate the mean differences among three treatment conditions.For this study,df between subjects = 18.

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A repeated-measures design involves measuring the same participants multiple times under different conditions. Therefore, there is only one group of participants in the study, and there is no between-subjects variability. As a result, there is no between-subjects degrees of freedom (df). The correct df would be df within subjects = n-1 = 9.

A Repeated-Measures Study Uses a Sample of N = 10