Dr. Barber is conducting a study on the effects of touch on positive responses. She arranges for servers to touch their customers on the arm 0, 2, or 4 times. She then measured the amount of tips given by customer. The control group in this study was
A) those who were not touched.
B) those who were touched twice.
C) those who were touched four times.
D) those who were touched 0, 2, or 4 times.
E) those who were touched either 2 or 4 times.

Question

Quizplus · Accepted Answer

The control group in an experiment is the group that does not receive the experimental treatment. In this study, the treatment is the act of touching, so the group that was not touched (0 times) serves as the control group against which the effects of being touched 2 or 4 times can be compared.

Dr Barber Is Conducting a Study on the Effects of Touch