Question

CHITTARANJAN SA : Ok
84 : The value of Square of r for a particula
situation is 0.81 What is coefficient of
correlation​

Answer 1

Answer:

If the coefficient of determination is 0.81, the correlation coefficient could be either +0.9 or -0.9. Therefore, option (b) is correct.

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Answer 2

Given : The value of "Square of r" for a particular situation is 0.81.

To Find :  coefficient of correlation

0.81

0.9

0.09

0.085​

Solution:

r is coefficient of correlation

Square of r = r²   is coefficient of  determination

coefficient of  determination  = ( coefficient of correlation)²

 ( coefficient of correlation)² =  r²

=>   ( coefficient of correlation)² =  r²  = 0.81   given

Taking square root

=> coefficient of correlation = r  = 0.9

Hence  coefficient of correlation is 0.9

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