These were generated by a computer software and may look different from the plots generated by the packages you use. (In particular, note that the axes of the Normal probability plot are swapped relative to the plots we have made in the text. We only care about the pattern of this plot, so it should not affect your interpretation.)

Examine these plots, and discuss whether the assumptions and conditions for the multiple regression seem reasonable.

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Normal Scores Residuals 1000 800 Residuals Plot 600 400 200 0 122000 124000 126000 128000 130000 132000 134000 136000 138000 140000 1420000 -200 -400 -600 -800 Predicted Normal Probability Plot 1.5 05 -800-600-400 100 200 400 600 800 1000 1.5 Residuals