In a two-factor ANOVA,where a is the number of factor A levels and b is the number of factor B levels,the number of degrees of freedom for the interaction term is
A) (a - 1)(b - 1)
B) ab - 1
C) (a - 1)+ (b -1)
D) Unknown;need to know the number of replicates.

Question

Quizplus · Accepted Answer

The degrees of freedom for the interaction term in a two-factor ANOVA is calculated as (a - 1)(b - 1), where a is the number of levels of factor A and b is the number of levels of factor B.

In a Two-Factor ANOVA,where a Is the Number of Factor