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Why is it important to only test one variable in an experiment?

Answer

Because if you change more than one variable at a time, you can't tell which is affecting the results.
Q&A Related to "Why is it important to only test one variable..."
Variables are factors in an experiment that can change. There are three types of variables in a scientific experiment: independent, dependent and controlled variables. The scientist
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In an experiment if you test with more
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When you compare results where only one variable is used you can more readily correlate varience to that variable. With more than one variable, it becomes difficult to figure out
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