Which is correct and most complete with regard to the regression flowchart in Figure 15.5?

a. Acceptability checks cannot include residuals plots.

b. Models of on-hand data must be used with caution.

c. Adding or removing model terms cannot address outliers.

d. The initial model must be a first order polynomial.

e. All of the above are correct.

f. All of the above are correct except

(a) and (e).