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Spearman's coefficient of correlation - class-XI

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Multiple Choice

Correlation rank coefficient for the tied rank is 

  1. $1-\dfrac{6\sum D^2}{n(n^2-1)}$
  2. $\dfrac{1}{n}\sum(x-\overline x)(y-\overline y)$
  3. $\dfrac{\dfrac{1}{n}\sum(x-\overline x)(y-\overline y)}{\sigma _x\sigma _y}$
  4. $1-\dfrac{6[\sum D^2+\dfrac{1}{12}(m _1^3-m _1)+frac{1}{12}(m-2^3-m _2)+....]}{n(n^2-1)}$
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