An experimental study is conducted examining the relationship between drinking caffeine and reaction time. Participants are given caffeine by the experimenters in different amounts, and then are assessed on various tests of reaction time. In this study, the amount of caffeine that a participant drinks is the
A) random variable.
B) independent variable.
C) dependent variable.
D) control variable.

Question

Quizplus · Accepted Answer

The amount of caffeine that a participant drinks is the independent variable because it is the variable that is being manipulated by the experimenters to observe its effect on reaction time, which would be the dependent variable.

An Experimental Study Is Conducted Examining the Relationship Between Drinking