A Harris Poll surveyed 2085 U.S. adults regarding use of cell phones while driving. All the adults were asked their opinion regarding how dangerous it is for a driver to use a cell phone while driving. Graph (a) shows the percentage responding €œvery dangerous€ by age group. Only the adults who drive and who have a cell phone were asked how often they talk on the cell phone while driving. Graph (b) shows the percentage responding €œnever€ by age group.
Cell Phone Use and Driving

(a) What trend does this survey portray regarding age group and the opinion that using a cell phone while driving is very dangerous?
(b) How does the behavior of never using a cell phone while driving compare to the opinion that using a cell phone while driving is dangerous? Do you think that some of the differences in the behavior (never use a cell phone while driving) and the opinion (using a cell phone while driving is very dangerous) can be attributed to the differences in the survey population? Explain.

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Percentage Who Think It Is Very Dangerous to Use a Cel Phone while Driving Percentage with Cell Phones Who Never Talk on Cell Phone while Driving 52% 0.6 0.4 0.2 0 0.6 0.4 0.2 22% 27% 33% 41% 24% 21% 14%