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Random Assignment and Equivalence

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If you randomly assign participants to groups, can you assume the groups are equivalent at the beginning of the study? At the end? Why or why not? If you cannot assume equivalence at either end, what can you do? Please explain.

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Randomization of groups in true experiments is used so that the participants all have an equal chance of being assigned to one of the experimental groups. If the groups are considered equivalent through randomization, then researchers are more likely to be able to reduce the chance of differences between the groups and to support cause and effect. The technique of random assignment allows the ...

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This solution discusses the use of randomization in experiments.

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Non-Equivalent Control Group Designs

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