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Explain which threats to internal validity are not covered by an evaluation of a parole program in which male parolees who are tested before and after the program are compared to a sample of men living in the same neighborhoods as the parolees and tested at the same times

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Explain which threats to internal validity are not covered by an evaluation of a parole program in which male parolees who are tested before and after the program are compared to a sample of men living in the same neighborhoods as the parolees and tested at the same times