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It is because most likely you are to have a fair test, it is to ensure that the test was fairly done and that your results aren't due to a "one off" or a change in the experiment. For example in an experiment using rats one experimental rat may be different to the other rat like be abnormal or slightly unusual and therefore you would have an unfair test as the two weren't the same. So you wouldn't get a correct measurement or end result.
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