Extraneous variables should be
A) applied only to the experimental group.
B) applied only to the control group.
C) maintained at the same level across all groups.
D) manipulated by the researcher.

Question

Quizplus · Accepted Answer

Extraneous variables are variables that can affect the outcome of an experiment but are not the variables of interest. To ensure the validity of an experiment, extraneous variables should be controlled or kept constant across all groups to avoid their confounding effects. Therefore, the best choice is to maintain them at the same level across all groups.

Extraneous Variables Should Be