12.37 Air Pollution Refer to Exercise 12.23, in which an air pollution monitor's response to ozone was recorded for several different concentrations of ozone. Use the MINITAB residual plots to comment on the validity of the regression assumptions.

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Percent 99 MINITAB output for Exercise 12.37 Residual 0.50- 0.25- 0.00- -0.25- Residuals versus the Fitted Value (response is NO) -0.50- 6 8 10 12 Fitted Value 95- 90- 80 70- 60- 50+ 40+ 30- 20- 10- -1.0 -0.5 Normal Probability Plot of the Residuals (response is NO) 05 1.0 Residual