Is it true that parametric tests are generally more powerful than nonparametric tests? If so, give two reasons why you might choose to use a nonparametric test instead of a parametric test.
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yes parametric tests are more powerful than non parametric tests since they take into considerations all the statistical assumptions necessary to carry out a specific test.
the reason why you might choose to use a non parametric test is when you have a data that is not heteroscedastic and does not follow a particular distribution
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