When is a non-parametric test more appropriate than a parametric test?
What will be an ideal response?
Non-parametric tests are more appropriate when it is unsafe to make the assumptions necessary to conduct parametric tests. For example, the t-test requires the calculation of a mean and SD. However, means and SDs are not meaningful unless the scale of measurement is interval or ratio. Thus, non-parametric tests would be used in this context.
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