Before the activity
You may wish to have students complete this activity in pairs or small groups. This way, they will be encouraged to ask questions of one another and defend their interpretations.
During the activity
Make sure students can justify their selections. You can use the following questions and suggestions to assess their understanding:
After the activity
Ask students to create their own line graph that represents activity during a day at a commonly known location. (If time and logistics permit, you can also include data gathering as part of this activity.) Be sure they provide appropriate elements on the graph, including labels for the axes, hints, and explanations. The explanations should demonstrate their reasoning for choosing the number of people present at each hour.