By including a covariate in your experimental design, you _____.
A) can look at both between-subjects and within-subjects effects
B) can assess the impact of carryover effects
C) reduce error variance and improve the sensitivity of your experiment to the effect of your independent variable
D) All of the answers are correct.

Question

Quizplus · Accepted Answer

Including a covariate helps to control for variability that is not of primary interest, thereby reducing error variance and increasing the sensitivity of the experiment to detect the effect of the independent variable.

By Including a Covariate in Your Experimental Design, You _____