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Cheung, Alan C. K.; Slavin, Robert E. – Educational Researcher, 2016
As evidence becomes increasingly important in educational policy, it is essential to understand how research design might contribute to reported effect sizes in experiments evaluating educational programs. A total of 645 studies from 12 recent reviews of evaluations of preschool, reading, mathematics, and science programs were studied. Effect…
Descriptors: Effect Size, Research Methodology, Research Design, Preschool Evaluation
Slavin, Robert E.; Lake, Cynthia; Hanley, Pam; Thurston, Allen – Center for Research and Reform in Education, 2012
This article presents a systematic review of research on the achievement outcomes of all types of approaches to teaching science in elementary schools. Study inclusion criteria included use of randomized or matched control groups, a study duration of at least 4 weeks, and use of achievement measures independent of the experimental treatment. A…
Descriptors: Science Achievement, Evidence, Teaching Methods, Control Groups