Describe the rank correlation test. What types of hypotheses is it used to test? How does the rank correlation coefficient rs differ from the Pearson correlation coefficient r?

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The Answer is The rank correlation test uses ranks to measure the strength of the relation between two variables. The rank correlation test is used to test the null hypothesis that there is no correlation between the two variables. The Pearson correlation coefficient r detects linear relationships between two variables. The rank correlation rs, also known as Spearman's rank correlation coefficient, detects relationships which are non-linear as well as linear.

Describe the Rank Correlation Test