METHODS OF DATA ANALYSIS
PARAMETRIC AND NON PARAMETRIC TESTS
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Question
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We want to conduct a Mann Whitney test on the IQ of girls and boys. A sample of 5 boys and 6girls was selected. There details are as follows:Boys-112, 113, 116, 112, 121. Girls-112, 115, 116, 121, 124, 118. Find sum of ranks of Boys
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42
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24
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22
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44
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Explanation:
Detailed explanation-1: -The Mann-Whitney (Wilcoxon rank-sum test) should be used for comparison between cohorts with sample sizes greater than 30, significantly different sample sizes, or if a normal distribution of samples cannot be assumed.
Detailed explanation-2: -The Mann Whitney U test, sometimes called the Mann Whitney Wilcoxon Test or the Wilcoxon Rank Sum Test, is used to test whether two samples are likely to derive from the same population (i.e., that the two populations have the same shape).
Detailed explanation-3: -Types of question examined using the Mann-Whitney U For example, Did the horse racing finishes differ by horse sex (male vs. female)?
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