In an experiment with two independent variables, the occurrence of an interaction means that
A) the experiment was poorly designed.
B) there was a ceiling effect.
C) the effect of one independent variable was different at different levels of the other independent variable.
D) the effect of one independent variable was the same at all levels of the other independent variable.

Question

Quizplus · Accepted Answer

An interaction occurs in an experiment when the effect of one independent variable on the dependent variable changes depending on the level of the other independent variable. This means the influence of one variable is not consistent across the levels of the other variable, indicating that the variables interact with each other in affecting the outcome.

In an Experiment with Two Independent Variables, the Occurrence of an Interaction