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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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