Question

A researcher wanted to test the effect of caffeine on sleep. Fifty students volunteered to participate in the study and signed up for one of two nights. Thirty-three students participated on Tuesday night. They each were given two cups of regular coffee to drink one hour before going to sleep. Seventeen students participated on Wednesday night. They each were given two cups of decaffeinated coffee to drink one hour before going to sleep. Each student was monitored with an EEG (a test that looks at brain function) to record exactly when they fell asleep. Students in the caffeine group took significantly longer to fall asleep. The researcher concluded that caffeine interferes with the ability to fall asleep. In the experiment, the control group is/are the ____

Answer 1

There was no control group in Experiment One.

Step-by-step explanation:

There were no control groups in the first case or experiment one including thirty-three students who have been participated in the Tuesday night.

Control group: It is defined as the group in any psychological study or experiment that does not undergo any treatment by the experimenter or researcher and then later on used as a standard of measuring how the other tested participants or subjects do.