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

question 93

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) . 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. Which of the following can be used to determine whether the schedule adjustment reduced the average lateness time of 12 minutes?

• A) H₀: μ = 8, H_A: μ ≠ 8
• B) H₀: μ < 12, H_A: μ ≥ 12
• C) H₀: μ ≥ 12, H_A: μ < 12
• D) H₀: ≥ 8, H_A: < 8

---

Definitions:

Trade-in Allowance

The value offered by a seller for a buyer's existing asset as part of the payment for a new asset.

Accumulated Depreciation

The total amount of an asset's cost that has been allocated as depreciation expense over the asset's useful life.

Cost Basis

The original value or purchase price of an asset or investment for tax purposes, adjusted for stock splits, dividends, and return of capital distributions.

Trade-in

A transaction where an item is exchanged as part of the payment for a new item, often used in car purchases to trade an old vehicle towards the price of a new one.