A Nonparametric test is one that assumes that the population from which a sample is drawn is normally distributed or approximately so.

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A nonparametric test does not assume that the population from which a sample is drawn is normally distributed. Nonparametric tests do not rely on specific assumptions regarding the shape or parameters of the population distribution. They are used when the data is not normally distributed or when the sample size is small.

A Nonparametric Test Is One That Assumes That the Population