Asked by Stella

Four pairs of data yield r=0.942 and the regression equation y-hat=3x. Also, y-bar=12.75. What is the best predicted value for x=4.3?

I know that the answer is 12.5, but how do you know to use the y-bar value instead of plugging the x value into the equation?
Answered by Stella
Nevermind, I figured it out!! :)
Answered by Charlie
Well, I have the same question and can't figure it out how do you know when to use which one?
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