Should An Experiment Test Only One Variable At A Time? Why Or Why Not?

(Correct Answer Below)

Should An Experiment Test Only One Variable At A Time? Why Or Why Not?

A. Yes, an experiment should only test one variable at a time. That way, the experiment will only have to be performed once. B. Yes, an experiment should only test one variable at a time. This ensures that the experimental outcome is clearly due to one identifiable factor. C. No, it is not necessary to test only one variable per experiment, especially when time is of the essence. D. As long as the experiment is repeated a sufficient number of times, it doesn't matter how many variables are used. E. none of the above
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B. Yes, an experiment should only test one variable at a time. This ensures that the experimental outcome is clearly due to one identifiable factor.
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