Question

17. In simple regression analysis the quantity that gives the amount by which Y (dependent variable) changes for a unit change in X (independent variable) is called the
A. Coefficient of determination
B. Slope of the regression line
C. Y intercept of the regression line
D. Correlation coefficient
E. Standard error

18. A simple regression analysis with 20 observations would yield ________ degrees of freedom error and _________ degrees of freedom total.
A. 1, 20
B. 18,19
C. 19, 20
D. 1, 19
E. 18, 20

19. The correlation coefficient may assume any value between
A. 0 and 1
B. -´ and ´
C. 0 and 8
D. -1 and 1
E. -1 and 0

Answer 1

17. B
In simple regression analysis the quantity that gives the amount by which Y (dependent variable) changes for a unit change in X (independent variable) is called the SLOPE OF THE REGRESSION LINE. If the correlation coefficient is a positive value, then the slope of the regression line must also be positive.

18. B
A simple regression analysis with 20 observations would yield n-2 = 18 degrees of freedom error and n-1 = 19 degrees of freedom total.

19. D
The correlation coefficient may assume any value between -1, and 1.