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

question 77

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.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:

Evolutionary Changes

Alterations in the genetic makeup of a population over successive generations due to natural selection, genetic drift, mutation, and gene flow.

Identity Crisis

According to Erikson, a period of inner conflict during which one examines one’s values and makes decisions about one’s life roles.

Operant Conditioning

A simple form of learning in which an organism learns to engage in behavior that is reinforced.

Latency Stage

In psychoanalytic theory, the fourth stage of psychosexual development, characterized by repression of sexual impulses and development of skills.