If a control group is not used during an experiment,the researcher cannot rule out the possibility that something other than the treatment is creating the observed results.

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Without a control group, there is no way to ensure that any observed changes or effects are truly due to the treatment being tested and not to other factors such as chance, bias, or confounding variables. A control group provides a baseline for comparison, and allows the researcher to isolate the effects of the treatment from those of other variables.

If a Control Group Is Not Used During an Experiment,the