When conducting an experiment, what is the purpose of having a control group?

The purpose of having a control group in an experiment is to provide a baseline for comparison with the experimental group that is affected by the independent variable. The control group allows researchers to observe what happens in the absence of the independent variable, ensuring that any changes observed in the experimental group can be attributed to the manipulation of that variable rather than other external factors. This comparison is crucial for determining the effect of the independent variable on the dependent variable, making the findings of the experiment more valid and reliable.

In experiments, having a control group enhances the overall rigor of the scientific method by highlighting the specific impacts of the variable being tested. Without a control group, it would be difficult to draw accurate conclusions regarding the experimental outcomes, as researchers would lack an essential point of reference.