1. A linear regression... A. gives a relationship between three variables that c
ID: 3227939 • Letter: 1
Question
1. A linear regression...
A. gives a relationship between three variables that can be described by a line.
B. gives a relationship between two variables that cannot be described by a line.
C. contains only two variables.
D. gives a relationship between two variables that can be described by a line.
2. In a regression model, the slope represents the
A. change in the independent variable due to a one unit change in the dependent variable.
B. change in y due to a one unit change in x.
C. point where the y-axis intersects the x-axis.
D. point where the x-axis intersects the y-axis.
3. In the equation y = 12 + 6x , 12 is the
A. dependent variable
B. y-intercept.
C. slope of the line.
D. independent variable
4. In the equation y = 100 - 5x , 100 is the
A. change in y due to a one-unit change in x
B. value of y when x is equal to 1
C. point where the line intersects the y-axis
D. point where the line intersects the x-axis
5. In the equation y = 100 - 5x , -5 is the
A. change in y due to a one-unit change in x
B. change in x due to a one-unit change in y
C. point where the line intersects the x-axis
D. value of y when x is equal to 1
6. In the regression model y = A +Bx + e , x is the
A. independent variable, B. error term, C. missing variable, D. dependent variable
7. In the regression model y^ = a + bx , a and b are the
A. random varibles, B. omitted variables, C. population parameters, D. estimates of the population parameters, A and B.
A. -130.33 B. 168.33 C 57.12 D. -34.04
9. The table below gives six pairs of x and y values.
x: 16,20,12,10,14,9
y: 8,13,9,5,6,4
What are the values of SSxx and SSxy?
A. xx=22.819, xy=24.138
B. xx=24.138, xy=22.819
C. xx=58.500, xy=83.500
D. xx=83.500, xy=58.500
10. The following table lists the monthly incomes (in hundreds of dollars) and the monthly rents paid (in hundreds of dollars) by a sample of six families.
Monthly Income: 24,16,19,31,11,27
Monthly Rent: 7.0,4.5,6.5,12.8,4.5,8.5
For the regression of y on x, what are the values of a and b?
A. a=.52,b=-3.75
B. a=.384,b=-.89
C. a=-3.75,b=.52
D. a=-.89,b=.384
Explanation / Answer
Sol1:
D. gives a relationship between two variables that can be described by a line.
2. In a regression model, the slope represents the
y=change in y/change inx
B. change in y due to a one unit change in x
3.
y=a+bx
a is y inetrcept
b is slope
SOlution4:
y inetrcxept =100 where y cuts y axis
C. point where the line intersects the y-axis.
Solution5:
. In the equation y = 100 - 5x , -5 is the
A. change in y due to a one-unit change in x
Solution6:
B error term
SOlution7:
Answer D:
estimates of the population parameters, A and B.
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