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What is the main purpose of controlled variables in an experiment?

What is the main purpose of controlled variables in an experiment?
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What is the main purpose of controlled variables in an experiment?

User Davit Sargsyan
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The control variable strongly influences experimental results, and is held constant during the experiment order to test the relative relationship of the dependent and independent variable
User Haru Atari
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They help ensure changes in the independent variable are affecting the dependent variable. 
User Lev Zakharov
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