A tape measure is taped vertically on a wall. The viewer will stand a designated distance from the tape measure. With the 3" PVC pipe in hand, the viewer will tell what length he/she sees on the wall. The data should be recorded in the chart below.

For Algebra, students will plot the data and find the relationship for the points. There is a linear relationship. Since slope is rise over run, the measurement of the inside diameter of the tube over the length of the tube turns out to be the slope.

For Statistics, students will find the best line of fit using Regression techniques.

Gather the materials needed for the activity.