Assignment 10 Answers - QBA 2305 Answers to Assignment 10 1...

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QBA 2305 – Answers to Assignment 10 1. Regression output confidence interval variables coefficients std. error t (df=36) p-value 95% lower 95% upper Intercept 0.9828 People 2.4282 0.2259 10.749 8.72E-13 1.9700 2.8863 Parking 1.0343 0.1785 5.793 1.32E-06 0.6722 1.3964 Comp -1.1742 1.0503 -1.118 .2710 -3.3043 0.9558 City -21.7998 10.2112 -2.135 .0396 -42.5091 -1.0906 Multiple Regression Equation Sales (Y) = 0.983 + 2.43 (People) + 1.034(Parking) + (-1.174)Comp + (-21.800)City 2. H 0 β 1  =  β 2  =  β 3  =  β 4  = 0  (None of the independent variables are lineraly related to Sales) H1: At least 1 of the β ’s (multiple regression coefficients) 0 3. People, Parking and City are significant at a 5% level of significance People and Parking are significant at a 1% level of significance 4. It is appropriate to interpret the multiple regression coefficient for the “People” explanatory variable since it is significant at a 1% level. Interpretation : For each additional 1,000 people living within 5 miles of the store, we would expect the store’s annual sales to increase by \$2,430 while holding the variables in the regression equation constant.

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