The Spearman rank correlation test is a nonparametric test that (1) uses the directions of differences observed in a matched pairs sample to determine whether the relative frequency distributions of two statistical populations are identical to or different from one another, and (2) determines whether a sample comes from a population with a specified median.

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The Spearman rank correlation test is a nonparametric test that assesses how well the relationship between two variables can be described using a monotonic function, not for comparing distributions or medians.

The Spearman Rank Correlation Test Is a Nonparametric Test That