In a two-factor analysis of variance a main effect is defined as the ____.
A)mean differences among the levels of one factor
B)mean differences among all treatment conditions
C)mean difference between the two factors
D)difference between the largest treatment mean and the smallest treatment mean

Question

In a two-factor analysis of variance a main effect is defined as the ____.​
A)​mean differences among the levels of one factor
B)​mean differences among all treatment conditions
C)​mean difference between the two factors
D)​difference between the largest treatment mean and the smallest treatment mean

Quizplus · Accepted Answer

A main effect is the mean difference among the levels of one factor. It represents the overall effect of that factor on the dependent variable, regardless of the levels of the other factor. This can be calculated by averaging the scores for each level of the factor and comparing them.

In a Two-Factor Analysis of Variance a Main Effect Is