How are the first degrees of freedom for the interaction in a two-way, between-groups ANOVA calculated?
a. (Number of levels of the first factor + 1) × (Number of levels of the second factor + 1)
b. (Number of levels of the first factor ? 1) × (Number of levels of the second factor ? 1)
c. (Number of levels of the first factor ? 1) + (Number of levels of the second factor ? 1)
d. (Number of levels of the first factor) × (Number of levels of the second factor)
Ans: B
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