When checking for the significance of a main effect, the degrees of freedom for the denominator are equal to the
A)error degrees of freedom (df for SSW)
B)error degrees of freedom minus 1
C)total sum of squares' degrees of freedom
D)number of levels of the main effect minus 1

Question

Quizplus · Accepted Answer

The degrees of freedom for the denominator when checking for the significance of a main effect are equal to the error degrees of freedom, which are often referred to as the degrees of freedom for the within-groups sum of squares (SSW). This is because the variability due to the error (or within groups) is what the main effect is being compared against to determine if the main effect is statistically significant.

When Checking for the Significance of a Main Effect, the Degrees