### Home > ACC7 > Chapter 9 Unit 10 > Lesson CC3: 9.1.4 > Problem9-50

9-50.

This problem is a checkpoint for scatterplots and association. It will be referred to as Checkpoint 9.

Jason is interested in buying a used Panda hybrid car because he heard of its incredible gas mileage. Jason collected data from listings on the Internet.

1. Jason would like to know the typical cost of advertised Pandas. What kind of a graphical display should he use?

2. What type of graph should be used to display the relationship between age and cost?

3. Make a scatterplot of the data.

4. Fully describe the association.

5. Draw a line of best fit for the data. Find the equation of the line of best fit.

6. Use the equation to predict the expected cost of a 6-year-old car.

7. Interpret the slope and y-intercept in context.

 Age of Car (years) Listed Cost ($1000\text{s}$ of \$) $5$ $3$ $4$ $2$ $8$ $9$ $3$ $10$ $20$ $26$ $24$ $29$ $11$ $8$ $25$ $6$

Check your answers by referring to the Checkpoint 9 materials located at the back of your book.

Ideally, at this point you are comfortable working with these types of problems and can solve them correctly. If you feel that you need more confidence when solving these types of problems, then review the Checkpoint 9 materials and try the practice problems provided. From this point on, you will be expected to do problems like these correctly and with confidence.

Answers and extra practice for the Checkpoint problems are located in the back of your printed textbook or in the Reference Tab of your eBook.