What is the key purpose of using a control variable?

The key purpose of using a control variable is to provide a standard for comparison. Control variables are elements that are kept constant throughout an experiment to ensure that the results are due to the independent variable being tested, rather than other external factors. By maintaining a consistent baseline, researchers can more accurately determine the effect of the independent variable on the dependent variable. This comparison allows for a clearer understanding of how the changes made during the experiment influence the outcomes, leading to more reliable and valid conclusions.

In scientific experiments, control variables play a crucial role in increasing the accuracy of results. They help to eliminate any unexpected fluctuations that could skew the data, thereby amplifying the reliability of the findings. This control process is essential in establishing cause-and-effect relationships within experimental research.