Which of the following statements about interaction effects is TRUE?
A) An interaction effect is simply the sum of two main effects.
B) If you get both a main effect and an interaction, the main effect for one independent variable may apply only to one condition of the other independent variable, not to both conditions.
C) There cannot be an interaction effect if there is a main effect.
D) If you get an interaction effect, you do not have to conduct any follow-up tests.

Question

Quizplus · Accepted Answer

An interaction effect means that the effect of one independent variable depends on the level of another independent variable. Therefore, the main effect of one independent variable may apply only to one condition of the other independent variable, not to both conditions. It is not simply the sum of two main effects, and there can be both a main effect and an interaction effect. Follow-up tests are necessary to determine the nature of the interaction effect.

Which of the Following Statements About Interaction Effects Is TRUE