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Why is it important to alter only one variable at a time when designing and experiment?

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User Homen
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Answer: A variable within a scientific experiment is something that is changed (i.e. it varies). There should be only one manipulated variable within a scientific experiment so that the experimenter can be certain it is this variable which causes a pattern in the resultant data, if any exists at all.

Step-by-step explanation:

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User Catalin Marin
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