The Head of Public Safety Notices That the Average Driving

question 71

Essay

The head of public safety notices that the average driving speed at a particular intersection averages 35 mph with a standard deviation of 7.5 mph.After a school speed limit sign of 20 mph is placed at the intersection,the first 40 cars travel past at an average speed of 32 mph.Using the .01 significance level,was there a significant change in driving speed?
a.Use the five steps of hypothesis testing.
b.Sketch the distributions involved.
c.Advanced topic: Figure the confidence limits for the 99% confidence interval.
d.Explain the logic of what you did to a person who understands hypothesis testing for studies in which the sample consists of a single individual but is unfamiliar with hypothesis testing involving a sample of more than one individual.Be sure your explanation includes a discussion of the distribution of means-what it is,the logic of how it is figured-and its role in the overall hypothesis testing process.Advanced topic: Explain the logic and computation of the confidence intervals.

---

Definitions:

Autonomy

The state of being self-governed or having the freedom to act independently, often applied in the context of workers and units within organizations.

Distributors

Entities that purchase products from manufacturers and sell them to retailers or consumers, acting as intermediaries in the supply chain.

Labor Unions

Organizations that represent the collective interests of workers in negotiations with employers over wages, work conditions, and rights.