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A Non-Parametric Method to Compare Two or More Populations, When

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A non-parametric method to compare two or more populations, when the samples are matched pairs and the data are either ordinal or interval but not normal, is the: AWilcoxon signed rank sum test. B sign test.C Friedman test.DKruskal-Wallis test. \begin{array}{|l|l|}\hline A&\text {Wilcoxon signed rank sum test. }\\\hline B&\text { sign test.}\\\hline C&\text { Friedman test.}\\\hline D&\text {Kruskal-Wallis test. }\\\hline \end{array}


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