12-43. In Exercise 12-24 we fit a model to the response PITCH in the heat treating data
Chapter 12, Problem 12-43(choose chapter or problem)
12-43. In Exercise 12-24 we fit a model to the response PITCH in the heat treating data of Exercise 12-10 using new regressors x1 SOAKTIME SOAKPCT and x2 DIFFTIME DIFFPCT. (a) Calculate the R2 for this model and compare it to the value of R2 from the original model in Exercise 12-10. Does this provide some information about which model is preferable? (b) Plot the residuals from this model versus and on a normal probability scale. Comment on model adequacy. (c) Find the values of Cooks distance measure. Are any observations unusually influential?
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