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Peer reviewedPowers, Stephen; And Others – Journal of Educational Measurement, 1983
The validity of the equipercentile hypothesis of the Title I Evaluation and Reporting System norm-referenced evaluation model was examined using 3,224 seventh- and ninth-grade students. Findings from confidence interval procedures contradicted the equipercentile hypothesis. There was a pattern of large gains for students not receiving any special…
Descriptors: Achievement Gains, Evaluation Methods, Evaluation Needs, Hypothesis Testing
