In experimental design, diffusion refers to
a. people leaving a study
b. people changing over time
c. a treatment effect spreading from group to group
d. a treatment having less and less effect
e. a treatment affecting a control group
c. a treatment effect spreading from group to group
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Indicate whether the statement is true or false
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What will be an ideal response?
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Fill in the blank(s) with the appropriate word(s).