Discussion
Which one of the following tests is not a non-parametric test ?
Answer: D
The test that is not non-parametric is Student's t-test.
The t-test is a parametric test: it compares means and assumes interval or ratio data drawn from normally distributed populations, with equal variances in the usual two-sample form.
The other three are non-parametric tests, which make no such distributional assumptions and often work on ranks. The Kolmogorov-Smirnov test compares distributions, the Wilcoxon signed-rank test compares two related samples, and the Mann-Whitney U test compares two independent samples, the non-parametric counterpart of the independent t-test.
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