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Question
Terence, one of the participants in the control group told Grace that his group found out that "˜the other kids were getting a program to help their math scores' and therefore they decided to get together in a study group once a week to help each other. Grace was very concerned. What threat does this student action represent?a. John Henry Effect
b. Multiple treatment interference
c. Experimenter effects
d. Treatment diffusion
Answer
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