a. The R2 of a multiple regression of y on x1 and x2 measures the ________. percentage of the variation in y that is explained by the variability of x2 percentage of the variation in y that is explained by the variability of x1 statistical significance of the coefficients in the sample regression equation percentage of the variation in y that is explained by the sample regression equation
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a. The R2 of a multiple regression of y on x1 and x2 measures the ________.
-
percentage of the variation in y that is explained by the variability of x2
-
percentage of the variation in y that is explained by the variability of x1
-
statistical significance of the coefficients in the sample regression equation
-
percentage of the variation in y that is explained by the sample regression equation
b. The sample
True or False?
c. Costco sells paperback books in their retail stores and wants to examine the relationship between the prices and sales. The price of a particular novel was adjusted each week and the weekly sales are in the following table. Management would like to use a simple linear regression model that uses prices to predict sales.
| Sales | Price | ||
| 7 | $ | 12 | |
| 4 | $ | 11 | |
| 5 | $ | 10 | |
| 9 | $ | 9 | |
| 8 | $ | 8 | |
| 8 | $ | 7 | |
| 7 | $ | 7 | |
The regression sum of squares for this sample is equal to ________.
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6.25
-
4.17
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5.16
-
4.61
d. The coefficients of each explanatory variable in a multiple linear regression model have the same interpretation as the coefficient of the explanatory variable in a simple linear regression model.
True or False?
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