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

question 9

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. The value of the test statistic is ________.

• A) t₃₅ = -2.00
• B) z = -2.00
• C) t₃₅ = -0.33
• D) z = -0.33

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Definitions:

R

In electrical engineering, symbolically represents resistance, the property of a material that opposes the flow of electric current, measured in ohms (Ω).

Z

Often represents impedance in electrical circuits, a measure of opposition to AC including both resistance and reactance.

RC Parallel Circuit

A circuit configuration consisting of a resistor (R) and a capacitor (C) connected in parallel with each other across a power supply.

R

Commonly used to symbolize resistance in electrical equations and diagrams, measured in ohms (Ω).