Answer:
Control group
Explanation:
As an experiment is being designed, the control group is made up of those research participants that do not receive the experimental treatment.
The experimental treatment here is where half of the students are in a warm classroom. The aim is to get effect of high temperature on behavior in preschoolers.
So those in a warm class are the experimental group while those in the normal class are the control group. They are used to make comparisons on the cause and effect in the study