Chapter A.6, Problem 99E

Fill in the blanks.

1. a. In multiple linear regression analysis, a residual is the difference between an _____ and _____.
2. b. A plot of the residuals versus the values of a predictor variable should fall roughly in a _____ centered and symmetric about the _____, if the assumptions for multiple linear regression inferences are met.
3. c. The sum of the residuals from the least squares multiple linear regression is _____.