Exam 4 - 1. In a multiple regression problem involving two...

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Unformatted text preview: 1. In a multiple regression problem involving two independent variables, if b 1 is computed to be +2.0, it means that A) the estimated average of Y increases by 2 units for each increase of 1 unit of X 1 , holding X 2 constant. B) the relationship between X 1 and Y is significant. C) the estimated average of Y is 2 when X 1 equals zero. D) the estimated average of Y increases by 2 units for each increase of 1 unit of X 1 , without regard to X 2 . 2. The coefficient of multiple determination r 2 Y .12 A) measures the proportion of variation in Y that is explained by X 1 and X 2 . B) measures the variation around the predicted regression equation. C) measures the proportion of variation in Y that is explained by X 1 holding X 2 constant. D) will have the same sign as b 1 . 3. In a multiple regression model, which of the following is correct regarding the value of the adjusted r 2 ? A) It can be larger than 1. B) It can be negative. C) It has to be larger than the coefficient of multiple determination. D) It has to be positive. 4. The variation attributable to factors other than the relationship between the independent variables and the explained variable in a regression analysis is represented by A) error sum of squares. B) regression mean squares. C) regression sum of squares. D) total sum of squares. 5. TABLE 14-1 A manager of a product sales group believes the number of sales made by an employee ( Y ) depends on how many years that employee has been with the company ( X 1 ) and how he/she scored on a business aptitude test ( X 2 ). A random sample of 8 employees provides the following: Referring to Table 14-1, for these data, what is the value for the regression constant, b ? A) 4.698 B) 3.103 C) 21.293 D) 0.998 6. TABLE 14-1 A manager of a product sales group believes the number of sales made by an employee ( Y ) depends on how many years that employee has been with the company ( X 1 ) and how he/she scored on a business aptitude test ( X 2 ). A random sample of 8 employees provides the following: Referring to Table 14-1, for these data, what is the estimated coefficient for the variable representing years an employee has been with the company, b 1 ?...
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Exam 4 - 1. In a multiple regression problem involving two...

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