Noelle,a Psychologist,conducts a Study to Establish Whether Caffeine Increases the Ability

Noelle,a psychologist,conducts a study to establish whether caffeine increases the ability to run.She has two groups of participants run on a treadmill for 15 minutes.One group drinks regular coffee before running,while the other group drinks decaffeinated coffee before running.The group that drinks decaffeinated coffee is the

A) confederate group.
B) control group.
C) experimental group.
D) confound group.

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