The EPA Has Stipulated That the Pollution Standard Index (PSI)

question 95

Multiple Choice

The EPA has stipulated that the Pollution Standard Index (PSI) for clean air standards is to average no more than 100. A random sample of nine days for the city of Acorn showed PSI readings of 144, 85, 90, 120, 150, 105, 93, 130, and 115. Assume the population of PSI readings is highly nonnormal. The EPA wants to determine if there is significant evidence to conclude that Acorn's air is dirtier than the stipulated clean air standards. Which one of the following tests is appropriate for this problem?

• A) Wilcoxon signed ranks test
• B) Wilcoxon rank sum test
• C) sign test
• D) Kruskal-Wallis test
• E) Spearman's rank correlation test

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Definitions:

Employee Association

An organization that represents the collective interests of employees, often in negotiations with the employer.

Certified Union

A labor union that has been officially recognized and approved to represent workers in bargaining and legal matters.

Wage Negotiations

The process where employees and employers discuss and agree upon the terms of payment for work done.

Decertify

The process of revoking or nullifying the certification of an entity, often used in the context of labor unions.