In an experiment, what is the control group used for?

The control group is essential in experimental design as it serves as a baseline that allows researchers to compare the effects of the independent variable. By having a control group, scientists can determine if the outcomes observed in the experimental group (which is subjected to the treatment) are a direct result of the treatment or if they might have occurred due to other factors.

In comparison, while other groups may interact with the treatment and the independent variable, they lack the standard of treatment provided to the control group. The control group typically receives no treatment or a placebo, thus providing a reference point against which any changes observed in the experimental group can be measured. This comparison is crucial for validating the results and determining the efficacy or impact of the treatment being tested. Ultimately, this setup helps ensure that conclusions drawn from the experiment are reliable and scientifically valid.