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Peer reviewedStock, William A.; Behrens, John T. – Journal of Educational Statistics, 1991
The accuracy and bias of estimates of whisker length based on box, line, and midgap plots were examined. For each type of graph, 20 different undergraduates (n=60) viewed 48 single-plot graphs. Whisker-length estimates for box and line plots were more accurate and less biased than those for midgap plots. (TJH)
Descriptors: Comparative Analysis, Estimation (Mathematics), Graphs, Higher Education
Peer reviewedBajgier, Steve M.; Aggarwal, Lalit K. – Educational and Psychological Measurement, 1991
Ignorance of the characteristics of a mixed population may lead to bias in a summary measure of a phenomenon. A test based on sample kurtosis is demonstrated by a simulation study to be more powerful than six other known tests in detecting a class of mixed normal distributions. (SLD)
Descriptors: Comparative Analysis, Computer Simulation, Equations (Mathematics), Goodness of Fit
