Question: In Problem 13 5 on page 470 you used the percentage

In Problem 13.5 on page 470, you used the percentage of alcohol and chlorides to predict wine quality (stored in VinhoVerde). Using the results from that problem,
a. construct a 95% confidence interval estimate of the population slope between wine quality and the percentage of alcohol.
b. at the 0.05 level of significance, determine whether each independent variable makes a significant contribution to the regression model. On the basis of these results, indicate the independent variables to include in this model.

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