The two groups are called control and experimental.
There are two major divisions of an experimental setup:
The control group forms the basis for comparison with respect to the results of the experiment. They are subjected to the same conditions as the experimental group, except when it comes to the independent variable.
The experimental group is the group on which the independent variable is tested. They are also called the treatment group. The effect of the treatment is measured with the reference being the control group.
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