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Random assignment helps researchers control or hold constant factors that differ between control and experimental groups, except for the Independent variable.

Random control assignments help us to make sure that the members of each and every group in the experiment are the same. This will help ensure that the groups are likely representing more of what is present in the larger population.

Random control assignments also make sure that the other variables, which are likely to affect changes in the dependent variables are distributed equally within the groups, which in turn reduces the systematic bias.

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