A control is the standard by which test variables can be compared.
An experiment is a test under controlled conditions made to either demonstrate a known truth, examine the validity of a hypothesis, or determine the efficacy of something previously untried.
In an experiment, controlling an experiment means designing an experiment so that the effects of one or more variables are reduced or eliminated.
A control is a separate group or subject in an experiment against which the results are compared.
Therefore, it can be said that a control is the standard by which test variables can be compared.
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