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Abstract

Paired-samples designs are used frequently in educational and behavioral research. In applications where the response variable is quantitative, researchers are encouraged to supplement the results of a paired-samples t-test with a confidence interval (CI) for a mean difference or a standardized mean difference. Six CIs for standardized mean differences were examined and two were found to perform well under a wide range of conditions.

Keywords

effect size pretest–posttest design matched-pairs design within-subject design repeated measures design

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Interval Estimation of Standardized Mean Differences in Paired-Samples Designs

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