Question: For the regression model for the wire bond pull strength data in Exercise 12-8. (a) Plot the residuals versus and versus the regressors used in

For the regression model for the wire bond pull strength data in Exercise 12-8.
(a) Plot the residuals versus and versus the regressors used in the model. What information do these plots provide?
(b) Construct a normal probability plot of the residuals. Are there reasons to doubt the normality assumption for this model?
(c) Are there any indications of influential observations in the data?

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