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Peer reviewedHopkins, Kenneth D.; Chappell, David – Educational and Psychological Measurement, 1994
Quick power estimates for detecting a difference in two population proportions are expedient during early stages of research planning. Such estimates are tabled and graphed in this article. They are shown to be conservative but accurate for most research situations when proportions fall in the range of 0.25 to 0.75. (SLD)
Descriptors: Comparative Analysis, Data Collection, Estimation (Mathematics), Graphs
