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Mean, variance, t-statistic, z-score, chi-squared statistic, F-statistic, Mann-Whitney U, Wilcoxon W, Pearson's correlation and so on.
The two samples must be independent and the data must be at least ordinal. Under those conditions the Mann-Whitney U test can be used.
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Check out Chapter 11a of the VassarStats website:http://faculty.vassar.edu/lowry/webtext.htmlAlso, see the Web Link provided at the lower left.
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