Why can't you test two variables in the same trial?

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asked Dec 10, 2018 234k views

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Sgmorrison · Answer 1 · 2018-12-17T16:58:25+0000

If you test more than one variable at a time during an experiment, you wouldn't know which variable caused the desired change in the end once you have gathered all your data.

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Why can't you test two variables in the same trial?

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