Question: 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

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 Cook’s distance measure. Are any observations unusually influential?

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