Transportation Statistics and Microsimulation

Inferences Concerning Categorical Data    ◾    177

are under the age of forty-ve, and twenty are over the age of sixty.

Each participant is given alcoholic beverages at een-minute inter-

vals until his or her BAC is .06%. ree drivers from the under the

age of forty-ve group and ve from the older group had driving

mishaps. Provide condence intervals for the mean dierence of the

proportion of drivers adversely eected by a BAC of .06%.

3. A transportation engineer is comparing two strategies for cutting

down on red light violations. e rst strategy uses warning signs of

the upcoming trac signal. e second uses sensors to keep signals ...