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Ms. White identified 12 students in her class who appeared to have low self-esteem. She invited these students to participate in a special after-school program

Ms. White identified 12 students in her class who appeared to have low self-esteem. She invited these students to participate in a special after-school program designed to improve students' self-esteem. After a month, she again rated the students on self-esteem. The results indicated a significant improvement in self-esteem for these students. Identify factors that could provide alternative explanations for the findings and would thus threaten the internal validity of the study

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