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Nonparametric Tests and Parametric Tests

Can you explain if it is 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.

Can you explain if a researcher is examining preferences among four new flavors of ice cream? A sample of n = 80 people is obtained. Each person tastes all four flavors and then picks a favorite. The distribution of preferences is as follows. Do these data indicate any significance preferences among the four flavors? Test at the .05 level of significance.

Ice Cream Flavor
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Solution Summary

The solution discusses when a nonparametric test is more powerful than parametric test and gives two reasons to justify.