All of the following are methods for controlling the effects of extraneous variables in experiments except A) if practical, hold such extraneous variables constant B) assign treatments to test units randomly C) use experimental designs that control for the effects of extraneous variables D) eliminate the effect of extraneous variables on test units

Question

Quizplus · Accepted Answer

The effect of the variables on test units remains; potential extraneous variables must be controlled for in one of the other three ways listed.

All of the Following Are Methods for Controlling the Effects