Regarding multiple linear regression analysis:
a. What sum of squares is made as small as possible when finding the best-fitting plane based on the method of least squares?
b. What do we call the best-fitting plane that is obtained by the method of least squares?
c. What do we call the act of using a multiple linear regression equation to make predictions for values of the predictor variables that are outside the region of the observed values of the predictor variables?
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