A fitted least squares regression line

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A fitted least squares regression line:

A. may be used to predict a value of y if the corresponding x value is given

B. is evidence for a cause-effect relationship between x and y

C. can only be computed if a strong linear relationship exists between x and y

D. none of these alternatives is correct

Answer: Option A

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Assertion (A): If regression coefficient of X on Y is greater than one, regression coefficient of Y on X must be less than one.
Reason (R): The geometric mean between two regression coefficients is the coefficient of correlation.

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