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In order to ensure that experimental and control groups are similar before the experiment begins, social scientists sometimes:

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  1. 25 June, 16:58
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    -pair subjects who are identical on relevant variables and assign one to the control group and one to the experimental group

    -create groups that are equivalent in terms of their averages on some relevant variables

    -randomly assign subjects to the experimental and control groups

    -match subjects on relevant variables

    - (all of these choices)
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