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Direct linkHuang, Chiungjung – Educational and Psychological Measurement, 2009
This study examined the percentage of task-sampling variability in performance assessment via a meta-analysis. In total, 50 studies containing 130 independent data sets were analyzed. Overall results indicate that the percentage of variance for (a) differential difficulty of task was roughly 12% and (b) examinee's differential performance of the…
Descriptors: Test Bias, Research Design, Performance Based Assessment, Performance Tests
