An interaction occurs when one main effect in a factorial ANOVA is significant but the second one is not.

Name: An interaction occurs when one main effect in a factorial ANOVA is significant but the second one is not.
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An interaction occurs in a factorial ANOVA when the effect of one independent variable on the dependent variable differs across the levels of another independent variable, regardless of whether the main effects are significant.

An Interaction Occurs When One Main Effect in a Factorial