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Chez Henri is a restaurant chain that operates in 40 different cities. It hired an economist to estimate the factors affecting the demand for its sales. The following equation was estimated using cross sectional data from each of its 40 restaurants.
Y: Annual restaurant sales (in thousands)
X1: Disposable per capital income (in thousands) of the residents living within 5 miles of a restaurant
X2: Population (in thousands) within a 5-mile radius of a restaurant
X3: Number of competing restaurants within a 5-mile radius
The following information was obtained from the regression analysis:Multiple R: 0.92R-Square: 0.85Std. Error of Est.: 0.40
Analysis of Variance
DFSum SquaresMean Sqr.F-Stat
Regression322073.318.2
Residual36601.7
VariableCoefficientStd. ErrorT-Value
Constant0.40.22.0
X10.010.0042.5
X20.020.0151.3
X3-20.24.50-4.6
a. Give the estimated demand equation for predicting restaurant sales.b. Provide an interpretation for each of the regression coefficients.c. Which of the coefficients are statistically significant and which are not? Explain.d. What percent of variation are restaurant sales explained by this equation?
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