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A psychologist conducts a study to establish whether caffeine increases the ability to run. the psychologist 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.

Sagot :

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