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Judge A ranks 1,2,3,4,5 and judge B ranks the same entrants 2,1,4,3,5. Find rho.

A0.60
B0.90
C0.40
D0.80
Answer & Solution
Correct answer: D. 0.80
The differences are 1,1,1,1,0 so the sum of squares is 4, and rho = 1 - 24/120 = 0.8.
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