The Boston Public School District Has Had Difficulty Maintaining On-Time

question 43

Multiple Choice

The Boston public school district has had difficulty maintaining on-time bus service for its students ("A Year Later,School Buses Still Late," Boston Globe,October 5,2011) .Suppose the district develops a new bus schedule to help combat chronic lateness on a particularly woeful route.Historically,the bus service on the route has been,on average,12 minutes late.After the schedule adjustment,the first 36 runs were an average of eight minutes late.As a result,the Boston public school district claimed that the schedule adjustment was an improvement-students were not as late.Assume a population standard deviation for bus arrival time of 12 minutes.At the 5% significance level,does the evidence support the Boston public school district's claim?

• A) No,because the p-value is less thanα.
• B) Yes,because the p-value is less than α.
• C) No,because the value of the test statistic is greater than the critical value.
• D) Yes,because the value of the test statistic is greater than the critical value.

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