In an experimental test of the effects of Vitamin B-12 on problem-solving performance, ______ is the independent variable, and ______ is the dependent variable.
A) problem-solving performance; the vitamin
B) problem-solving performance; a placebo
C) the vitamin; problem-solving performance
D) a placebo; the vitamin

Question

Quizplus · Accepted Answer

In an experimental test, the independent variable is the variable that the researcher manipulates, which in this case is Vitamin B-12. The dependent variable is the variable that is measured, and which is affected by the independent variable, which in this case is problem-solving performance. Therefore, the best choice is C: the vitamin is the independent variable, and problem-solving performance is the dependent variable.

In an Experimental Test of the Effects of Vitamin B-12