Exhibit 9-5 
Assume population is normally distributed.
-Refer to Exhibit 9-5. If the test is done at a 2% level of significance, the null hypothesis should
Definitions:
Nitrogen Oxide
Gases produced from the reaction between nitrogen and oxygen during combustion at high temperatures, often contributing to air pollution.
Pollution Authority
An organization or regulatory body responsible for controlling or reducing pollution to protect the environment.
Tradable Permits
A system where rights to emit pollution or other substances are given a market value and can be bought and sold.
Environmental Protection Agency
A U.S. federal agency responsible for creating and enforcing regulations to protect the environment and public health from pollution and hazardous substances.
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