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Spearman's rank correlation expressed as...

Spearman's rank correlation expressed as

A

`r_k = 1 - (6sum D^2)/(N^2 - N)`

B

`r_k = 1 - (6sum D^2)/(N^3 - N)`

C

`r_k = 1 - (8sum D^2)/(N^3 - N)`

D

`r_k = 1 - (9sum D^2)/(N^3 - N)`

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The correct Answer is:
B
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