A Class Experiment

This activity was adapted from one originally written by
Cynthia Lanius, Rice University.

- Together with a partner, measure each other’s height and arm span in centimeters.
- Arm Span is measured with the arms held out horizontally. Measure across the person’s back from fingertip to fingertip.
- Call out your data for everyone to copy into the table below.

Name of Student | Height (cm) | Arm Span (cm) | Name of Student | Height (cm) | Arm Span (cm) |
---|---|---|---|---|---|

- Take a piece of quadrille paper and draw two axes. Label the horizontal axis “Height (cm)” and the vertical axis “Arm Span (cm).”
- On each axis, number the squares to fit the data.
- Plot each point.
- Label the Graph. Use an area of the graph where there are no points. Write an appropriate title such as “Arm Span of Lee High School Students”

- Draw a “best fit” line through the data?
- Calculate the slope of the line.
- Slope = rise/ run or (y1- y2) / (x1- x2)
- Do you think a person’s arm span increases with his height? Use your graph to support your answer.
- Use the best fit line to estimate what arm span a person 2 meters tall might have. Is anyone in your class this tall? Who?
- How tall is 2 meters in feet and inches?