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Download full textTipton, Elizabeth – Society for Research on Educational Effectiveness, 2013
Recent research on the design of social experiments has highlighted the effects of different design choices on research findings. Since experiments rarely collect their samples using random selection, in order to address these external validity problems and design choices, recent research has focused on two areas. The first area is on methods for…
Descriptors: Experiments, Research Methodology, Middle Schools, Secondary School Mathematics
