Mann-Whitney test is not just a test of medians: differences in spread can be important.
Hart
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A
Statistics Group, Faculty of Science, University of Central Lancashire, Preston PR1 2HE. ahart@uclan.ac.uk
D002986:Clinical Trials as Topic; D003627:Data Interpretation, Statistical; D006801:Humans; D016247:Information Storage and Retrieval; D012680:Sensitivity and Specificity; D018709:Statistics, Nonparametric