An experimenter was interested in the effect of caffeine on a performance test.Three equivalent groups consumed high, moderate, or low amounts of caffeine before taking the performance test.This experiment had
A) three independent variables.
B) one independent variable with three levels.
C) three dependent variables.
D) one dependent variable with three levels.

Question

Quizplus · Accepted Answer

The experiment only has one independent variable, which is the amount of caffeine consumed, and it has three levels: high, moderate, and low. Therefore, the correct answer is B, which states that there is one independent variable with three levels. The experiment also has only one dependent variable, which is the performance test. So, there is no need for multiple dependent variables or multiple independent variables.

An Experimenter Was Interested in the Effect of Caffeine on a Performance