Which statement BEST describes an interaction in a two-way ANOVA?
A) The two independent variables have a combined effect on the dependent variable that is not present with either independent variable alone.
B) Both independent variables have a main effect.
C) No variable has a main effect.
D) The study is a within-subjects design, so all participants receive all levels of each independent variable.

Question

Quizplus · Accepted Answer

An interaction in a two-way ANOVA occurs when the effect of one independent variable on the dependent variable depends on the level of the other independent variable. In other words, the two independent variables have a combined effect on the dependent variable that is not present with either independent variable alone. Therefore, option A is the best choice. Option B describes main effects, option C describes the absence of main effects and interactions, and option D describes a within-subjects design, which is not necessarily related to the presence of an interaction.

Which Statement BEST Describes an Interaction in a Two-Way ANOVA