Scatter plots move in two dimensions which allow students to see changes in slope as well as the relationship of the two data sets. The study of scatter plots lends to a lot of fun experiments and can also serve as a great segue to discussions on proportionality or the coordinate system.
Ramp Height & Distance Traveled.
We decided to build ramps and plot the height verses distance traveled. We increased the ramp in (approximately) one inch blocks and rolled a golf ball off the ramp to measure the distance traveled. See Below. To get better results we took the average of three rolls. Lots of FUN!