Beth E. Klingher
This unit is intended for grades 6 to 8, but could be adapted to older or younger students. It is assumed that students have already mastered basic graphing skills including how to create and interpret bar, line and circle graphs as well as histograms and box plots, also known as box and whiskers graphs. Students should have an understanding of how to determine a good interval and scale for a graph, and calculate the mean, median and mode. In addition, it is helpful if students already have basic skills in using Microsoft Excel to create graphs.