What is the relationship between main effects and interactions?
A) At least one of the factors involved in the interaction must have a main effect.
B) None of the factors in the interaction can have a main effect.
C) All of the factors involved in the interaction must have main effects.
D) The existence of an interaction is independent of the main effects.

Question

Quizplus · Accepted Answer

The presence of an interaction effect between variables in an analysis of variance (ANOVA) or similar statistical models does not depend on whether the individual variables also show main effects. An interaction effect occurs when the effect of one variable on the outcome depends on the level of another variable, and this can happen regardless of whether either variable has a significant main effect.

What Is the Relationship Between Main Effects and Interactions