# Lesson 1-Attachment II

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Name:                                         Date:                          Hour:

“A Scientific Approach To Buying a Car” Worksheet
My name is Jun Kim, Jr. I am so excited; I just turned 16 last week and got my first job. I have
to travel 4 miles from my house and 5 miles from school through high-traffic areas with no
bicycle lanes. I will be working after school three days a week from 4:00 p.m. to 7:00 p.m. and
9:00 a.m. to 12:00 p.m. on Saturdays. I have no way of getting to work because my parents work
full-time during the day. On evenings and Saturday mornings, my dad coaches my brother’s
soccer team and my mother runs a Girl Scout troop.

I also walk my little sister Julie and little brother Ian to the bus stop every morning. By the time
I walk them to the bus stop, I have 2 minutes to get to my bus stop, which I have to run to get
there. I have missed the bus on several occasions and had to walk 3 miles to school. Then, I am
done with school at 2:50 and catch the 3:00 bus back home. My siblings are out of school at
3:30. And then, I have to go over to my siblings’ bus stop to be there in time to pick them up
when they arrive at 4:00.

How can I keep my job and still help my parents get my siblings home safely while they are at
work? I need to come up with an arrangement to justify getting a car. I will have a budget of
\$10,000 to buy the car and include future costs for maintenance, repairs, and car insurance.

1. Define the Problem.

2. Formulate a Hypothesis. Under what conditions will the car-buying be justified?

1
3. Gather Information. Please fill out the table for 5 cars.

In the space below, list possible resources and/or websites that you could use to find your information.

Approx. Cost
Car       Car Make        Car        Gas Mileage        Cost of      of Insurance
Year      & Model        Mileage     (per gallon)        Car         (per month)              Resource

With this data, you will need to make 4 graphs, for the categories mentioned as A, B, C, and D on page 3 and 4.
Make 2 graphs on each side of the graph paper. You must decide which category is the dependent variable and
which category is the independent variable. Then, put the category on the correct axis and graph the data
accordingly.

Be sure to label the both the y-axis and x-axis, including the tick marks and units, as needed. To decide the
scale of your axis, let the interval between the tick marks = (high value-low value) / (number of tick marks). Be
sure to title the graph as well. You may use markers or colored pencils if you like. Once complete, answer the
questions on the following page.
2
4. Analyze Data.

In the space provided, please answer the designated questions for each trend.

A. Cost, Age of Car: bar (stacked) graph

     Which is the dependent variable?

     Which is the independent variable?

     How old was the most expensive car? least expensive?

     What trend in Cost occurs as the Age of the Car increases? decreases?

B. Make, Gas Mileage: bar graph

     Which is the dependent variable?

     Which is the independent variable?

     Which make had the best Gas Mileage? worst Gas Mileage?

     Was there a difference in gas mileage between the type of car (e.g. sports car, sedan,
truck, van, etc.)? Why or why not?

3
C. Age of Car, Cost of Insurance: line graph

   Which is the dependent variable?

   Which is the independent variable?

   Which Age of the Car was the least expensive to insure? most expensive? Why?

   Will these insurance rates always be the same? Why or why not?

   What trend in the Cost of Insurance occurs as the age of the car increases? decreases?

D. Cost, Car Mileage: line graph.

   Which is the dependent variable?

   Which is the independent variable?

   What is the relationship between the car mileage and the age of the car?

   For your data, what is the average mileage per year for your cars? Is this higher or
lower than the national average of 12,000 to 15,000 miles per year?

4
5. Make a Conclusion. Which car is the best choice? What were the main factors in choosing

the car? Use your data to explain.

5

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