A two-way analysis of variance has r levels for one variable and c levels for the second variable with 2 observations per cell. The degree of freedom for interaction is
Hmm, let me think about this... I'm gonna go with option C, just because it sounds the most like a secret code. Who doesn't love a good rc-1 equation, am I right?
Ah, the classic two-way ANOVA question. I'm going with option D. Why? Because it's the only one that includes the '2' for the 2 observations per cell. Simple logic, right?
Hmm, let's see... Since there are r levels for one variable and c levels for the second, with 2 observations per cell, the degree of freedom for interaction should be (r-1)(c-1). Option B looks good to me!
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