Dr. Reggie Lau carries out a study with a hypothesis that caffeine enhances performance in sports. He lets the experimental group consume 100mg of caffeine and does not give any caffeine to the control group. He then makes the participants sprint for 20 minutes. In this experiment, which of the following is the independent variable?
A) The group that does not get any caffeine
B) The group that consumes caffeine
C) The performance on the sprint
D) The duration of the sprint

Question

Quizplus · Accepted Answer

The independent variable is the factor that is being manipulated, which in this case is whether or not the group consumes caffeine.

Dr Reggie Lau Carries Out a Study with a Hypothesis