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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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What are advantages and disadvantages of reusing?
it is cheaper
What are the advantages disadvantages of Reverse Logistics Thanks all?
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What are the advantages and disadvantages of shareblocks
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The disadvantages and advantages of collusion
