If the regression line of Y on X is Y =30 ­ 0.9X and the standard deviations are Sx  = 2 and Sy  = 9,  then the value of the correlation coefficient rxy is :

  • - ­0.3
  • -0.2
  • 0.2
  • 0.3

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 If the regression line of Y on X is Y =30&nb
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