A+ Answers

1. Describe the overall pattern of the relationship between hours spent telemarketing and number of new subscriptions.

2. What is the correlation between hours spent telemarketing and number of new subscriptions? [numerical answer required]

3. What is the equation for the least squares regression line? [Note: The OLI materials give the equation in the form Y = a + bx But Excel presents the equation as Y = bx + a. It doesn’t matter which way you express it as long as it is correct and you can distinguish between the intercept and the slope.]

4. If telemarketing hours increase by one hour, we would expect the number of new subscriptions to     by      .

 5. Predict the number of subscriptions for a month in which there were         hours of telemarketing.

 6. Explain why it would not be a good idea to predict the number of subscriptions for a month in which there were 1600 hours of telemarketing.

7. A researcher found that the relationship between the appraised value of a house (in thousands of dollars) and its age (in years) could be summarized by the regression equation: Appraised value = 400.8 - 2.5 * age. Interpret the value of the slope in the context of this study.

8. A medical researcher asks: What is the effect of age on blood pressure? Identify the explanatory and response variables.

9

70 will be the score at        hours.

10. In New York State there is a fairly strong positive correlation between principals’ salaries and the reading scores of their students. (This is true.) Upon learning this, a politician recommends that principals’ salaries be increased because this will cause students’ reading scores to increase. Good idea? (Explain your answer.)