Statistical tests that are not very sensitive to errors in assumptions are called parametric tests.
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Q. 2The Mann-Whitney U test is a nonparametric test that measures the degree of association between two variables for which only rank-order data are available.
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Q. 3The Wilcoxon rank-sum test is a nonparametric test that uses two independent simple random samples to determine whether the relative frequency distributions of two statistical populations of continuous values are identical to or different from one another.
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Q. 4Nonparametric 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. 5A 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. 6Nonparametric statistical methods generally specify hypotheses in terms of population distributions rather than parameters such as means and standard deviations.
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