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In Katia's Remedial Mathematics Study,she Collected Pretest Data from a Group

question 19

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In Katia's remedial mathematics study,she collected pretest data from a group of participants.She divided the participants into three groups.One group received no treatment,one group received instruction by a teacher-delivered intervention,one group received peer tutoring on the same problems.After the intervention she tested their math skills.With which validity threat should Katia be most concerned?


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