Two independent variables are confounded when
A) they both vary in the study
B) one varies and one does not
C) their separate effects cannot be tested
D) None of these are true

Question

Quizplus · Accepted Answer

Confounding occurs when the effects of two independent variables cannot be differentiated from each other, meaning that their separate effects cannot be tested. Therefore, option C is correct. Options A and B are incorrect because they do not accurately define confounding. Option D is also incorrect as there is an accurate answer (C).

Two Independent Variables Are Confounded When