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This paper illustrates how to design an experimental sample for measuring the effects of educational programs when whole schools are randomized to a program and control group. It addresses such issues as what number of schools should be randomized, how many students per school are needed, and what is the best mix of program and control schools.
Findings from the Extended-Service Schools Initiative
Launched in 1997, the Extended-Service Schools (ESS) Initiative helped establish after-school programs in 17 communities across the country, each of which adapted one of four program models to local circumstances and needs.
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