In an experiment, which describes the control group?

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The control group is the baseline you compare everything to, kept under the same conditions as the experimental group but without the treatment being tested. By not receiving the experimental intervention, any differences in outcomes can be attributed to the treatment itself rather than other factors. In this scenario, receiving no treatment matches that baseline role, making it the best description of a control group. The idea of receiving treatment would define the experimental group, not the control. Calibrating instruments is a separate data-collection step, and randomly choosing participants describes how groups are formed, not what the control group is.