Econ 3050
7. When every member of the accessible population has an equal chance of being selected to participate in the study, the researcher is using:
a) Simple random sampling
b) Stratified random sampling
c) Convenience sampling
d) Purposive random sampling
8. A regression line has been found that has nearly all the points lying directly on the line, and only a few of them stray away from the line. Therefore, the standard error of the estimate is likely to be
Huge.
Small.
0.
Undefined.
9. Correlation coefficient ranges from _______ to ____________.
a) - 1 to 0.
b) 0 to 1.
c) -1 to 1.
d) None of the above.
10. The correlation coefficient of determination is the:
a) Ratio of the explained variation to the total deviation.
b) Ratio of the unexplained deviation to the explained deviation.
c) Ratio of the unexplained deviation to the total variation.
d) Ratio of the explained variation to the total variation.
11. If the correlation coefficient r = 0.5 then the coefficient of determination is:
a) 0.10
b) 0.25
c) 1.00
d) 2.50
12. Which one of the following is NOT appropriate for studying the relationship between two quantitative variables?
Scatterplot
Bar chart
Correlation
Regression
13. In regression, an independent variable is sometimes called a response variable.
True
False
14. The simple linear regression equation can be written y = b0 + b1x. In the simple linear regression equation, the symbol y represents:
The average or predicted response
Estimated intercept
Estimated slope
Explanatory variable