Steven T. Opsine, supervisor of traffic signals for the Fairfax Company division of the Virginia State Highway Administration, must decide whether to install a traffic light at the reportedly dangerous intersection of Dolley Madison Blvd. and Lewisville Rd. Toward this end, Mr. Opsine has collected data on accidents at the intersection.
S.H.A. policy is to install a trafic light at an intersection at which the monthly expected number of accidents is higher than 7. According to this criterion, should Mr. Opsine recommend that a traffic light be installed at this intersection?
Solution
