An experimenter wants to study the relationship between caffeine and reaction time.She assigns participants as follows: Group One receives 50 milligrams of caffeine;Group Two receives 100 milligrams of caffeine;Group Three receives 200 milligrams of caffeine;Group Four receives no caffeine.Twenty minutes later all participants complete the reaction-time test.In this experiment,which group was the control group?
A) Group Four
B) Group Three
C) Group Two
D) Group One

Question

Quizplus · Accepted Answer

The control group is the group that does not receive the treatment (caffeine in this case) and serves as a baseline for comparison. In this experiment, Group Four received no caffeine and therefore serves as the control group.

An Experimenter Wants to Study the Relationship Between Caffeine and Reaction