Question

An experimenter studies the relationship between caffeine and reaction time. she designs her experiment with four groups. group 1 receives 100 mg of caffeine each in their cups of coffee, group 2 receives 200 mg of caffeine each in their cups of coffee, group 3 receives 300 mg of caffeine each in their cups of coffee, and group 4 receives no coffee. twenty minutes later, participants from all the groups are given a reaction-time test.
in this experiment, which group is the control group?
a. group 4
b. group 3
c. group 2
d. group 1

Answer 1

Answer: group 4

Explanation: A control act as a check in an experiment. The no caffeine group will be use to test by comparing the other groups against it. It helps exclude experimental errors and experimental bias. It help reduce the effect of the other variables on the independent variable