A repeated-measures study uses a sample of n = 8 participants to evaluate the mean differences between two treatment conditions.The analysis of variance for this study will have dfₑᵣᵣₒᵣ = 7.

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In a repeated-measures design, each participant is measured multiple times under different conditions. Therefore, the degrees of freedom for error in the ANOVA will be based on the number of participants minus 1. In this case, the sample size is n = 8, so the dfₑᵣᵣₒᵣ will be 7.

A Repeated-Measures Study Uses a Sample of N = 8