A nonparametric test for comparing two or more populations should be used instead of its parametric counterpart if:
A)no information about the shape of the populations is available.
B)the sample sizes are large.
C)the populations have equal means.
D)the populations are normally distributed.

Question

Quizplus · Accepted Answer

Nonparametric tests do not require assumptions about the shape of the populations, and are therefore a better choice when this information is not available. They are also robust to outliers and do not require the same degree of normality as parametric tests. The other options (B, C, D) do not accurately describe situations where a nonparametric test is necessary.

A Nonparametric Test for Comparing Two or More Populations Should