Chapter 12: Q.46 (page 718)
Do you think a linear fit is best? Why or why not?
It is not a right decision to fit linear line in the data.
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How many acres will be left to mow after 100 hours of work?
Ethan repairs household appliances like dishwashers and refrigerators. For each visit, he charges plus 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 and what is the slope? Interpret them using complete sentences.
The average number of people in a family that attended college for various years is given in Table 12.29.
a. Using “year” as the independent variable and “Number of Family Members Attending College” as the dependent variable, draw a scatter plot of the data.
b. Calculate the least-squares line. Put the equation in the form of: \(\hat{y}=a+bx\)
c. Find the correlation coefficient. Is it significant?
A credit card company charges when a payment is late, and a day each day the payment remains unpaid.
Is the equation linear? Why or why not?
Recently, the annual number of driver deaths per \(100,000\) for the selected age groups was as follows:
a. For each age group, pick the midpoint of the interval for the \(x\) value. (For the \(75+\) group, use \(80\).)
b. Using “ages” as the independent variable and “Number of driver deaths per \(100,000\)” as the dependent variable,
make a scatter plot of the data.
c. Calculate the least squares (best–fit) line. Put the equation in the form of: \(\hat{y}=a+bx\)
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