- Control group : control group refers to group of individuals in a study who are similar to the experimental subjects in every way but are not exposed to the treatment received by the experimental group. Their presence allows for a comparison of the differential effects of the treatment.
Other /More definition:
Control group is defined as a group made up of subjects in an experiment who do not receive the treatment but for whom all other conditions are comparable to those of subjects in the experimental group. Moreover, Control group refers to the participants in an experiment who do not experience the manipulation or treatment and whose responses or reactions are compared with those of participants who are treated actively to determine the effects of the manipulation In Industrial Psychology, Control group refers to a group of employees who do not receive a particular type of training so that their performance can be compared with that of employees who do receive training.

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