In the Fixed Effects Model with Interaction, Assume That There

Multiple Choice

In the fixed effects model with interaction, assume that there are 5 levels of factor A, 4 levels of factor B, and 3 observations (replications) for each of the 20 combinations of levels of the two factors. Then the number of degrees of freedom of the interaction sum of squares (SSAB) is

A) 60
B) 20
C) 15
D) 12
E) 59