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Chapter 12: Q.29 (page 717)
When testing the significance of the correlation coefficient, what is the alternative hypothesis?
The alternative hypothesis can be expressed as there is some significant correlation between the two variables in the population.
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Table contains real data for the first two decades of flu cases reporting
Find the correlation coefficient
Ethan repairs household appliances like dishwashers and refrigerators. For each visit, he charges per hour of work. A linear equation that expresses the total amount of money Ethan earns per visit is. What are the independent and dependent variables? What is the y-intercept and what is the slope? Interpret them using complete sentences.
For a given line of best fit, you compute that using data points, and the critical value is . Can the line be used for prediction? Why or why not?
Graph 鈥測ear鈥� vs. 鈥�# flu cases diagnosed.鈥� Do not include pre-1981. Label both axes with words. Scale both axes
SCUBA divers have maximum dive times they cannot exceed when going to different depths. The data in Table 12.4 show different depths with the maximum dive times in minutes. Use your calculator to find the least-squares regression line and predict the maximum dive time for feet.
| X (depth in feet) | Y (maximum dive time) |
| 50 | 80 |
| 60 | 55 |
| 70 | 45 |
| 80 | 35 |
| 90 | 25 |
| 100 | 22 |
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