Question: 2. Perform the following analysis for the stackloss data described in Exercise 2 in Section 12.3. (a) Using the residuals from fitting an MLR model

2. Perform the following analysis for the stackloss data described in Exercise 2 in Section 12.3.

(a) Using the residuals from fitting an MLR model on the three covariates with no polynomial or interaction terms, check the homoscedasticity assumption using the plot and formal test described in Example 12.3-3, and state your conclusion.

(b) Use the steps outlined in Section 12.4.1 to fit the MLR model by weighted LS. Report the p-value of the model utility test.

(c) Use confint(fit); confint(fitw) to obtain the 95% OLS and WLS CIs for the regression parameters. Which method gives shorter cIs?

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