Question: Use the data from Exercise 12.16 on page 453. (a) Estimate 2 using the multiple regression of y on x1, x2, and x3, (b) Compute

Use the data from Exercise 12.16 on page 453.

(a) Estimate σ2 using the multiple regression of y on x1, x2, and x3,

(b) Compute a 95% prediction interval for the observed gain with the three regressors at x1 = 15.0, x2 = 220.0, and x3 = 6.0.

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