Researchers studying the STAR data report anecdotal evidence that school principals were pressured by some parents to
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Researchers studying the STAR data report anecdotal evidence that school principals were pressured by some parents to place their children in the small classes. Suppose some principals succumbed to this pressure and transferred some children into the small classes. How would such transfers compromise the internal validity of the study? Suppose you had data on the original random assignment of each student before the principal's intervention. How could you use this information to restore the internal validity of the study?
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