Research shows that students get more out of seeing a graph almost immediately and the guide is based on that idea. Also the intent is for students to learn to use the tools to answer any Big Question the teacher may pose. Hopefully this will encourage inquiry learning. As Dr. Park said in an earlier class, most students can understand the basic principle in a line graph. In Oh Deer the graph we plotted after the excercise made the activity main focus clear.
All ages benefit when they can see the ideas and data.