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- 1. Multiple-choice1 minute1 pt
Regression is to _____ as correlation is to _____.
relation; prediction
prediction; relation
causation; association
- 2. Multiple-choice1 minute1 pt
If the correlation between the number of ounces of candy a child consumes on a weekly basis and the number of cavities that child has at the age of 13 is +0.86, what would we predict for a child who had a z score of –1.50 on the candy-consumed variable?
The child's z score on the variable number of cavities would be –1.29
The child's z score on the variable number of cavities would be +1.29.
The child's z score on the variable number of cavities would be –2.36.
- 3. Multiple-choice1 minute1 pt
Identify the formula for predicting an individual's z score on the dependent variable from their z score on the independent variable.
(rxy)(zx)
(rxy)(zy)
zx/zy
- 4. Multiple-choice1 minute1 pt
In the formula Ŷ = a + b(X), a is the:
slope.
intercept.
- 5. Multiple-choice1 minute1 pt
In the equation for a regression line, the intercept is the:
value for X when Y is equal to 0.
predicted value for Y when X is equal to 0.
- 6. Multiple-choice30 seconds1 pt
The proportionate reduction in error is a measure of the:
correlation between two variables.
amount of variance in our dependent variable explained by the independent variable.
- 7. Multiple-choice3 minutes1 pt
Which of the following represents the correct regression equation for this information?
Ŷ = .59 + .155 (X1) + .122 (X2)
Ŷ = 4.974 + .256 (X1) – .381 (X2)
Ŷ = 4.974 + .264 (X1) – .309 (X2)
Ŷ = 8.432 + 1.701 (X1) – 2.536 (X2)
- 8. Multiple-choice30 seconds1 pt
The numerical ranges of correlation coefficient are _____ and ______.
negative infinity; positive infinity
0; +1.00
–1.00; +1.00
- 9. Multiple-choice30 seconds1 pt
A positive correlation between hand size and foot size indicates that:
people with larger feet tend to have smaller hands.
people with larger feet also tend to have larger hands.
- 10. Multiple-choice1 minute1 pt
This relation is depicted in the scatterplot. Based on this scatterplot, what kind of relation did they find between intelligence and teaching efficacy?
positive
negative
- 11. Multiple-choice1 minute1 pt
In a re-analysis of published studies, Twenge and Im (2007) found that for the time period of 1958 to 2001, the need for social approval of people in the United States was negatively correlated with the U.S. divorce rate during that same period (the correlation coefficient was –0.38). This means that:
the need for social approval prevents people from seeking divorce.
the need for social approval spurs people to get divorced.
as the need for social approval increased, divorce rates decreased.
as the need for social approval increased, divorce rates increased.
