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13 March, 19:07

Why an experiment should test only one variable at a time.

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  1. 13 March, 21:45
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    Imagine you have an experiment testing more: let's say you measure the influence of temperature and light on the growth of plants. Your result show an influence, but you don't know whether it was temperature, light or a combination of both that caused this effect!

    If you test only one variable at the time, you won't run into this problem
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