Subjects are said to be assigned randomly when….

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Subjects are said to be assigned randomly when

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1. they are assigned to experimental and control groups from a sample representing the large population
2. they each have an equal chance of being assigned to either the experimental or control group
3. they are assigned to experimental and control groups so that the groups differ on some critical variable before the experiment begins
4. neither the experimenter nor the subject knows whether the subject is in the experimental or control group

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