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General
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Question

Karl Pearson's correlation coefficient between x and y for the following data will be approximately

  1. 0.40    
  2. – 0.40    
  3. 0.44    
  4. None of these    

The correct answer is: 0.44


    Use r equals fraction numerator sum left parenthesis x minus stack x with ̄ on top right parenthesis left parenthesis y minus stack y with ̄ on top right parenthesis over denominator square root of sum left parenthesis x minus stack x with ̄ on top right parenthesis to the power of 2 end exponent sum left parenthesis y minus stack y with ̄ on top right parenthesis to the power of 2 end exponent end root end fraction.

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