The Boston public school district has had difficuity mointaining on-time bus service for its students (A Year Later, School Buses Stl Late,"Boston Globe, October 5) Suppose the district develops a new bus schedule to help combat chronic lateness on a particularly woeful route. Historically, the bus been, on average, 12 minutes late. After the schedule adjustment,the first district cleimed that the schedule minutes The value of the test statistic is service on the route has 36 runs were an average of eight minutes late. As a result, the Boston public school adjustment was an improvement-students were not as late. Assume a population standard deviation for bus arrival time of 12 Multiple Choice b5-200 2-2.00 5 -033 -033