If there are two independent variables in a repeated measures factorial experiment, each with three levels, how many degrees of freedom are associated with the numerator of the F ratio of the interaction of the variables?
a. 9 c. 4
b. 6 d. can't say without more information
C
The df for the interaction equals (a - 1)(b - 1) where a is the number of levels of Factor A and b is the number of levels of Factor B.
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