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# The data used to fit the model in Exercise 1 are presented

ISBN: 9780073401331 38

## Solution for problem 3E Chapter 8.1

Statistics for Engineers and Scientists | 4th Edition

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Problem 3E

The data used to fit the model in Exercise 1 are presented in the following table, along with the residuals and the fitted values. Plot the residuals versus the fitted values. Does the plot indicate that the linear model is reasonable? Explain.

 Strength Manganese Thickness Residual Fitted Value 47.7 7.4 8.0 -0.111 47.811 50.9 8.8 10.0 0.709 51.609 51.7 8.8 10.0 0.091 51.609 51.9 8.8 10.0 0.291 51.609 50.0 8.1 7.1 -0.517 50.517 50.5 8.1 9.0 0.790 49.710 50.0 8.1 7.1 -0.517 50.517 49.7 8.1 9.0 -0.010 49.710 50.6 8.1 9.0 0.890 49.710 47.7 7.2 7.2 0.214 47.486 47.1 7.3 7.8 -0.464 47.564 45.0 7.3 11.8 -0.864 45.864 47.6 7.3 8.0 0.121 47.479 45.7 7.3 11.8 -0.164 45.864
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