Grace randomly assigns college-bound African-American students to an intervention to improve mathematics achievement or to a control condition. A participants in a control group told Grace, the researcher, 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


a

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What will be an ideal response?

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What measures the combined relationship of all the predictors with the criterion?

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