Lighthouse Initiative for Texas Classrooms

Middle School Activity Based on Problem 6

Based on AP* Statistics Problem 6, 1997

You are planning to sell a used 1988 automobile and want to establish an asking price that is competitive with that of other cars of the same make and model that are on the market. A review of newspaper advertisements for used cars yields the following data for 12 different cars of this make and model.

Production Year 1990 1991 1992 1987 1993 1991 1993 1985 1984 1982 1986 1979
Asking Price (in thousands of dollars) 6.0 7.7 8.8 3.4 9.8 8.4 8.9 1.5 1.6 1.4 2.0 1.0

6th Grade TEKS addressed: (6.1)(A); (6.1)(C); (6.2)(B); (6.10)(A); (6.10)(D); (6.11)(A); (6.11)(B); (6.12)(A); (6.12)(B)

A sixth grade activity based on this question with a sample of a student response is given on the next three pages.

7th Grade TEKS addressed: (7.11)(A); (7.11)(B); (7.12)(B)

Use this information to construct a scatter plot.

Estimate the asking price for your 1988 automobile. Give specific reasons how the information from the scatter plot helped you determine this price.

You are planning on buying a used 1995 automobile. Use the scatter plot to determine a price for this automobile. Justify your answer.

8th Grade TEKS addressed: (8.12)(A); (8.12)(B); (8.13)(B)

Use this information to construct a scatter plot. Find the median and the mean of the data in the chart.

Compare and contrast these three methods. Which method helps you determine the most reasonable asking price for your 1988 automobile? Give specific reasons why you think that one method is better than the other two.

Student Worksheet
Student Sample C

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