A Wilcoxon rank sum test for comparing two populations involves two independent samples of sizes 15 and 20 . If the value of un-standardized test statistic is T = 225, then the value of the standardized test statistic is z = -1.50.
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Q. 2In a Wilcoxon rank sum test for independent samples, the two sample sizes are 4 and 6, and the value of the Wilcoxon test statistic is T = 25 . If the test is a two-tail and the level of significance is 0.05, then the null hypothesis will be rejected.
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Q. 3A Wilcoxon rank sum test for comparing two independent samples involves two samples of sizes 6 and 9 . The alternative hypothesis is that the location of population 1 is to the left of the location of population 2 . Using a 0.05 significance level, the appropriate critical values are 31 and 65.
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Q. 4Nonparametric procedures are often, and perhaps more accurately, called free-agent statistics.
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Q. 5A nonparametric test is one that makes no assumptions about the specific shape of the population from which a sample is drawn.
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Q. 6Nonparametric tests are methods of inference that make no assumptions whatsoever about the nature of underlying population distributions or their parameters.
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Q. 7A parametric test is a hypothesis test that depends on certain specific assumptions about the probability distribution of population values or the sizes of population parameters.
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Q. 8Nonparametric tests are often more efficient than parametric tests.
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