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Download full textWhat Works Clearinghouse, 2017
The What Works Clearinghouse (WWC) Standards Briefs explain the rules the WWC uses to evaluate the quality of studies for practitioners, researchers, and policymakers. An aspect of a study is considered a confounding factor if it is not possible to tell whether the difference in outcomes is due to the intervention, the confounding factor, or both.…
Descriptors: Educational Research, Evaluation Criteria, Intervention, Research Reports
