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Occurs when the subjects chosen for an experiment have very low or very high pretest scores. For example, in an experiment for weight loss, the

Occurs when the subjects chosen for an experiment have very low or very high pretest scores. For example, in an experiment for weight loss, the persons chosen to go take a special diet pill were all over 300 pounds. In this case, any lifestyle change may cause them to lose weight, not the diet pill

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