A repeated-measures study uses a sample of n = 10 participants to evaluate the mean differences among three treatment conditions.The F-ratio for the repeated-measures ANOVA will have df = 2,18.

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The degrees of freedom for the numerator in a repeated-measures ANOVA are equal to the number of treatment conditions minus 1, which in this case is 3-1=2. The degrees of freedom for the denominator are equal to the total number of observations minus the number of treatment conditions, which is (10 participants) x (3 conditions) - (3 conditions) = 27. Therefore, the F-ratio has df = 2, 27-1 = 2,18.

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