In a research study in which the ingestion of caffeine pills is used to study the metabolic rate of sugar and overall level of alertness, which variable is the independent variable?
A) alertness
B) caffeine pills
C) judgment
D) sugar

Question

Quizplus · Accepted Answer

The independent variable is the one that is manipulated or changed by the researchers to observe its effects on other variables. In this study, caffeine pills are the variable being manipulated to study their effects on metabolic rate and alertness, making it the independent variable.

In a Research Study in Which the Ingestion of Caffeine