Which one of the following requires additional information to calculate coefficient of correlation between two variables when the data are collected on ratio scale ?

[A] Square root of the coefficient of determination

[B] Geometric mean of the two regression coefficients relating to two variables x and y

[C] Covariance divided by the product of standard deviations of variables x and y

[D] Reciprocal of the product of the standard deviations of two variables

Answer & Explanation
Answer: Reciprocal of the product of the standard deviations of two variables

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