In a study investigating the effects of three different diets (Diet) on physical abilities, twelve participants were divided evenly into three groups. Each group was assigned a particular diet and each participant was measured on a physical ability test on seven consecutive days (Trials). What are the appropriate denominator degrees of freedom for the F-test on the Diet × Trials interaction?
A) 2
B) 6
C) 12
D) 54

Question

Quizplus · Accepted Answer

The denominator degrees of freedom for the Diet × Trials interaction in a repeated measures ANOVA is calculated as (number of subjects - number of groups) × (number of trials - 1), which is (12 - 3) × (7 - 1) = 54.

In a Study Investigating the Effects of Three Different Diets