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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Indicate whether the statement is true or false
Communication impairments can result from
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What are three roles of special educators?
What will be an ideal response?
What measures the combined relationship of all the predictors with the criterion?
a. regression coefficient b. multiple correlation c. correlation matrix d. regression equation