Question: (Extra problem) Let Ybi be the fitted value of Yi from fitting the simple linear regression model. Show that b(Yi , Ybi) = |b(Yi ,

(Extra problem) Let Ybi be the fitted value of Yi from fitting the simple linear regression model. Show that b(Yi

, Ybi) = |b(Yi

, Xi)|. That is, the sample correlation coefficient of

{(Yi , Ybi)} n i=1 must be positive, and is equivalent to the absolute value of the sample correlation coefficient of {(Yi , Xi)} n i=1.

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