Discussion
Which of the following is a Non-Parametric Test ?
Answer: B
The non-parametric test is Wilcoxon's test (printed 'Wilcoxin's').
Non-parametric tests make no assumption that the data follow a particular distribution, such as the normal, and often work on ranks. The Wilcoxon signed-rank and rank-sum tests are the non-parametric alternatives to the paired and independent t-tests.
The t-test, F-test and Z-test are parametric: they assume normally distributed data, or large samples, and estimate population parameters such as means and variances.
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