Two-sample tests involve a comparison of two different populations or one population observed twice, for example, before and after a treatment, which qualifies them for classification under related two-sample tests. In Chapter 3, the Wilcoxon signed-rank test and the sign test were included among the one-sample tests, whereas both could have also been included in this section. The Wilcoxon signed-rank test and the sign test use the difference of two treatments on the same sample units and use one set of data; hence the decision to include them among the one-sample tests. However, both could have been considered as comparing two different populations and ...
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