In a study that examines the impact of caffeine intake on exam performance, a researcher randomly assigns participants to drink either caffeinated or decaffeinated coffee just prior to taking an exam. In this study, which participants were in the experimental group, and which were in the control group?
◦ The participants who drank the caffeinated coffee were in the control group; the participants who drank the decaffeinated coffee were in the experimental group.
◦ The participants who drank the caffeinated coffee were in the experimental group; the participants who drank the decaffeinated coffee were in the control group.
◦ This study does not have an experimental group; the participants who drank both types of coffee were in the control group.
◦ This study does not have a control group; the participants who drank both types of coffee were in the experimental group.
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