12.42. Interaction terms are needed in a two-way ANOVA model when (a) Each pair of variables is...

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12.42. Interaction terms are needed in a two-way ANOVA model when

(a) Each pair of variables is associated.

(b) Both explanatory variables have significant effects in the model without interaction terms.

(c) The difference in means between two categories of one explanatory variable varies greatly among the categories of the other explanatory variable.

(d) The mean square for interaction is huge compared to the error mean square.

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