Nonparametric tests of hypotheses,also called distribution free tests,require the population to be normally distributed.

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Nonparametric tests do not make assumptions about the population being normally distributed. They are used when the data does not meet the assumptions of parametric tests, such as normality or equal variance. Nonparametric tests use rankings or other methods to compare groups or variables.

Nonparametric Tests of Hypotheses,also Called Distribution Free Tests,require the Population