Grace Randomly Assigns College-Bound African-American Students to an Intervention to Improve

Multiple Choice

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