In a one-way repeated-measures ANOVA, a researcher measured 15 subjects under six different conditions. What number of degrees of freedom is correct for the F-ratio for testing the conditions effect?
A) 6, 90
B) 5, 90
C) 6, 70
D) 5, 70

Question

Quizplus · Accepted Answer

In a repeated-measures ANOVA, the degrees of freedom for the conditions effect is calculated as (k-1), where k is the number of conditions. Here, k=6, so df for conditions = 6-1 = 5. The error degrees of freedom is calculated as (n-1)(k-1), where n is the number of subjects. Here, n=15, so df for error = (15-1)(6-1) = 70. Therefore, the correct degrees of freedom for the F-ratio is 5, 70.

In a One-Way Repeated-Measures ANOVA, a Researcher Measured 15 Subjects