An interaction effect is a phenomenon where the effect of one independent variable on the dependent variable differs based on the level of a second independent variable.

Interaction Effect

The effect that arises when the impact of one independent variable on the dependent variable depends on the level of another independent variable.

Independent Variable

A variable that is manipulated or changed in an experiment to test its effects on the dependent variable.

Dependent Variable

The variable in an experiment that is expected to change in response to manipulations of the independent variable.