1. Which correlation coefficient indicates the weakest correlation between the variables?

a. r= -.37

b. r= .08

c. r= -.69

d. r= .55 2. Which of these is an example of multiple linear regression?

A. The relationship between the weight of a student predicts his or her grade point average.

B. The price and the sweetness of a pastry predict a taster's rating.

C. The number of employees in a company predicts the price of the company stock and its net profit.

D. The temperatures in Celsius predicts the possibility of rainfall on a particular day.

3. A genuine but weak correlation between two variables could also reach significance when ____.

A. the relationship is curvilinear

B. the sample is very large

C. there are many outliers

D. the line crosses the point of [0,0] in the scatter plot

4. What kind of correlation would one expect to find between the age of a car (nonclassic) and its value?

A. perfect

B. negative

C. positive

D. zero

5. In the equation= 98 + 4.30X, what is/are the slope(s)?

A. 4.30

B. 98

C. X D. Y^

6. Coffee consumption has been found to be negatively correlated with amount of sleep, with a correlation coefficient of 0.5. How much can coffee consumption account for the variance of amount of sleep?

A. 50%

B. 0.25%

C. 0.5%

D. 25%

7. Thettest performed on an individual predictor in a regression model is testing the null hypothesis that ____.

A. the effect size of the whole regression model is not significantly different from zero

B. the effect size of the whole regression model is significantly different from zero

C. the coefficient of the predictor is significantly different from zero

D. the coefficient of the predictor is not significantly different from zero

8. In a hypothesis test for the bivariate correlation coefficient, the null hypothesis is rejected when ___.

A. r = 0

B. r < alpha

C. p< alpha

D. p = 0

9. Using the Pearson correlation coefficient to analyze the relationship between two variables is only appropriate if the variables are ____ variables.

A. scale

B. ordinal

C. one scale and one nominal

D. nominal