In an experiment to test whether sleep deprivation affected student exam grades, a group of students (group a) slept their normal amount before coming to the exam. the other group (group b) only had 2 hours of sleep. group b represents the
a. experimental group
b. hypothesis
c. variable
d. control group

The correct answer is A. Experimental group

Explanation:

In experiments, the experimental group refers to the group of subjects that receives special treatment or in which the scientist or researcher intervenes. This is the opposite of a control group that does not receive treatment and therefore, it is used as a reference to measure the effect of the treatment.

This implies, in the experiment presented Group A is the control group as they do not have special treatment because they sleep normally and Group B is the experimental group as the researcher modifies their sleep time and reduces it two hours which means in this group there is a treatment or intervention.