Data Collectionmedium
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A school implements a new reading comprehension program in classrooms A, B, C (treatment) while D, E, F serve as controls. After 3 months, reading scores improved in both treatment AND control classrooms. Investigation reveals that treatment students talked with control students about reading strategies they learned, and some control students began using these strategies.
Which statement best describes this threat to internal validity?
A school implements a new reading comprehension program in classrooms A, B, C (treatment) while D, E, F serve as controls. After 3 months, reading scores improved in both treatment AND control classrooms. Investigation reveals that treatment students talked with control students about reading strategies they learned, and some control students began using these strategies.
Which statement best describes this threat to internal validity?