Chapter 12: Q.18 (page 715)
Does the scatter plot appear linear? Strong or weak? Positive or negative?

Short Answer
In the given scatter plot of the problem, the plot is not appear linear and weak and the correlation is negative.
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Chapter 12: Q.18 (page 715)
Does the scatter plot appear linear? Strong or weak? Positive or negative?

In the given scatter plot of the problem, the plot is not appear linear and weak and the correlation is negative.
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65. Explain what it means when a correlation has an of .
Graph 鈥測ear鈥 versus 鈥# flu cases diagnosed鈥 (plot the scatter plot). Do not include pre-1981 data.
For each of the following situations, state the independent variable and the dependent variable.
a. A study is done to determine if elderly drivers are involved in more motor vehicle fatalities than other drivers. The number of fatalities per driver is compared to the age of drivers.
b. A study is done to determine if the weekly grocery bill changes based on the number of family members.
c. Insurance companies base life insurance premiums partially on the age of the applicant.
d. Utility bills vary according to power consumption.
e. A study is done to determine if a higher education reduces the crime rate in a population.
The following table shows data on average per capita coffee consumption and heart disease rate in a random sample of \(10\) countries.

a. Enter the data into your calculator and make a scatter plot.
b. Use your calculator鈥檚 regression function to find the equation of the least-squares regression line. Add this to your scatter plot from part a.
c. Explain in words what the slope and y-intercept of the regression line tell us.
Amelia plays basketball for her high school. She wants to improve to play at the college level. She notices that the number of points she scores in a game goes up in response to the number of hours she practices her jump shot each week. She records the following data:
| X (hours practicing jump shot) | Y (points scored in a game) |
| 5 | 15 |
| 7 | 22 |
| 9 | 28 |
| 10 | 31 |
| 11 | 33 |
| 12 | 36 |
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