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When are non-parametric statistics are used? A. normal curves B. None of the options are correct...

When are non-parametric statistics are used?

A. normal curves

B. None of the options are correct

C. linear distributions

D. Skewed distributions

Math   Statistics-And-Probability   
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Answer #1

The correct option is (D), "Skewed distributions" because non-parametric statistics are used when one wants to test for median rather than mean which is in the case of skewed distributions.

The options normal curves and linear distributions assumes about the distribution of the population, that is, normality and linearity of the distribution of population.

But, there are no assumptions in the non-parametric test (also known as distribution free tests) regarding the distribution of the population.

Whenever, the assumptions of the parametric tests are violated, then the corresponding non-parametric tests are performed.

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