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Which of the following is a requirement for the pretest in an experiment? A. the pretest must be a previously validated instrument B. the pretest

Which of the following is a requirement for the pretest in an experiment? A. the pretest must be a previously validated instrument B. the pretest cannot refer to the treatment to be tested C. the pretest must be given only to the comparison group, not to the experimental group D. the pretest must be the same as the posttest

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