Question: 5. Use the data in Problem 7 of Section 16.3 to (a) Fit a multiple linear regression model using X1, X3, X4, and X6 as

5. Use the data in Problem 7 of Section 16.3 to

(a) Fit a multiple linear regression model using X1, X3, X4, and X6 as the predictor variables;

(b) Estimate the variance σ2.

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