When parametric assumptions are met, nonparametric tests have less statistical power than parametric tests.

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When the parametric assumptions are met, parametric tests tend to have more statistical power than nonparametric tests. Nonparametric tests are typically used when the assumptions of parametric tests are not met, and in such cases, nonparametric tests may have similar statistical power to parametric tests.

When Parametric Assumptions Are Met, Nonparametric Tests Have Less Statistical