The production of wine is amultibillion-dollar worldwide industry. In an attempt to develop a model of wine quality as judged by wineexperts, data was collected from red wine variants. A sample of 20 wines is provided in the accompanying table. Develop a multiple linear regression model to predict winequality, measured on a scale from 0(very bad) to 10(excellent) based on alcohol content(%) and the amount of chlorides.

a. State the multiple regression equation. Let X1i represent the alcohol content(%) of wine i and let X2i represent the number of chlorides for wine i.

Yi=___+( )X1i+( )X2i

b. Predict the mean quality rating for wines that have 9 percent alcohol content and chlorides of 0.07

c. Construct a 95% confidence interval estimate for the mean quality rating for wines that have 9 percent alcohol and 0.07 chorides.

• mean quality rating for wines that have 9% alcohol and 0.07 chlorides is ___ to ___
• wine quality prediction for a wine that has 9% alcohol and 0.07 chlorides is ___

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