The Following Scatterplot Displays Lung Capacity (Forced Expiratory Volume, Measured

Essay

The following scatterplot displays lung capacity (forced expiratory volume, measured in liters) vs. age (in years) for a sample of children:
1-3. Comment on the direction, strength, and form of the relationship between lung capacity and age. (Be sure to relate your comments to the context.)
The following scatterplot also incorporates information about whether the child is a smoker:
4. Do smokers tend to be older or younger than nonsmokers? Explain how you can tell from the graph.
5. For children of similar age, do smokers tend to have more or less lung capacity than nonsmokers? Explain how you can tell from the graph.