Which of the following is correct and most complete (for a model without x3)?

a. The regression estimate for sigma based on a first-order model is 0.944.

b. The SSR for a first order model is 6637.55.

c. The SSE for a first order model is 396.45.

d. There are no obvious outliers on a normal plot of residuals.

e. All of the above are correct.

f. All of the above are correct except

(a) and (e).