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b. (10 marks) In Section 2.3.5 of the Module 2a notes, in the equation for the Spearman rank correlation coefficient, rey, explain the role of

b. (10 marks) In Section 2.3.5 of the Module 2a notes, in the equation for the Spearman rank correlation coefficient, rey, explain the role of the difference, da, between the ranks of X and Y for each person i and how those differences can influence the final value of ry

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