When performing a rank test comparing two populations, we rank the sample observations from
both populations as though they were drawn from the same population.

Question

Quizplus · Accepted Answer

In rank tests comparing two populations, such as the Mann-Whitney U test, observations from both samples are indeed ranked together as if they were from a single population. This is done to assess differences between the populations based on the ranks of the observations rather than their raw values.

When Performing a Rank Test Comparing Two Populations, We Rank