In a study examining the effect of room illumination (low, medium, high) and room temperature (cold, warm, hot) on test performance, how many main effects are possible?
A)2
B)3
C)6
D)9

Question

Quizplus · Accepted Answer

Main effects are the individual effects of each independent variable on the dependent variable. In this study, there are two independent variables (room illumination and room temperature), so there are two main effects possible.

In a Study Examining the Effect of Room Illumination (Low