An advantage of holding a variable constant rather than using random assignment to form your groups is that holding a variable constant ____.
A) reduces error due to participant differences
B) is easier than randomization
C) prevents confounding
D) ensures a nonbiased sample

Question

Quizplus · Accepted Answer

Holding a variable constant prevents confounding, which occurs when two or more variables are systematically related and their effects on the outcome cannot be separated. By holding a variable constant, you are able to isolate the effect of a specific variable on the outcome, increasing the internal validity of the study.

An Advantage of Holding a Variable Constant Rather Than Using