Questions: In a double-blind study, researchers tested whether small doses of caffeine would improve highly trained male cyclists' times in a hot environment (95 degrees F, 25% humidity). The individuals were 9 highly trained male cyclists who rode a stationary bicycle in a hot climate chamber on three separate occasions. The first session was a familiarization session. On the second session, some athletes took a caffeine pill and the rest took a placebo pill of Metamucil. On the third session, each athlete took the other pill. For each of the second and third sessions, the cyclists were randomly assigned to the treatment and control groups. The study concluded that a small dose of caffeine improves a highly trained male cyclist's time in a hot environment. Complete parts (a) through (d) below. a. Describe the treatment and control groups. Choose the correct answer below. A. The treatment group is the 9 male cyclists after the sessions. The control group is the 9 male cyclists before the sessions. B. The treatment group is the 9 male cyclists before the sessions. The control group is the 9 male cyclists after the sessions. C. The treatment group is the 9 male cyclists when they took Metamucil. The control group is the 9 male cyclists when they took the caffeine pill. D. The treatment group is the 9 male cyclists when they took the caffeine pill. The control group is the 9 male cyclists when they took Metamucil.

Transcript text: In a double-blind study, researchers tested whether small doses of caffeine would improve highly trained male cyclists' times in a hot environment ( $95^{\circ} \mathrm{F}$, $25 \%$ humidity). The individuals were 9 highly trained male cyclists who rode a stationary bicycle in a hot climate chamber on three separate occasions. The first session was a familiarization session. On the second session, some athletes took a caffeine pill and the rest took a placebo pill of Metamucil. On the third session, each athlete took the other pill. For each of the second and third sessions, the cyclists were randomly assigned to the treatment and control groups. The study concluded that a small dose of caffeine improves a highly trained male cyclist's time in a hot environment. Complete parts (a) through (d) below. a. Describe the treatment and control groups. Choose the correct answer below. A. The treatment group is the 9 male cyclists after the sessions. The control group is the 9 male cyclists before the sessions. B. The treatment group is the 9 male cyclists before the sessions. The control group is the 9 male cyclists after the sessions. C. The treatment group is the 9 male cyclists when they took Metamucil. The control group is the 9 male cyclists when they took the caffeine pill. D. The treatment group is the 9 male cyclists when they took the caffeine pill. The control group is the 9 male cyclists when they took Metamucil.