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Chapter 12: Q. 62 (page 721)
62. If the level of significance is and the -value is , what conclusion can you draw?
The conclusion is that these two variables aren't correlated. Therefore, do not reject the null hypothesis.
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For a given line of best fit, you compute that r = 0 using n = 100 data points. Can the line be used for prediction? Why or why not?
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 |
A vacation resort rents SCUBA equipment to certified divers. The resort charges an up-front fee of and another fee of an hour.
Find the equation that expresses the total fee in terms of the number of hours the equipment is rented.
The height (sidewalk to roof) of notable tall buildings in America is compared to the number of stories of the building (beginning at street level).
a. Using 鈥渟tories鈥� as the independent variable and 鈥渉eight鈥� as the dependent variable, make a scatter plot of the data.
b. Does it appear from inspection that there is a relationship between the variables?
c. Calculate the least squares line. Put the equation in the form of: \(\hat{y}=a+bx\)
Use the columns "year" and "# flu cases diagnosed. Why is 鈥測ear鈥� the independent variable and 鈥�# flu cases diagnosed.鈥� the dependent variable (instead of the reverse)?
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