Exhibit 9-4

question 48

Multiple Choice

Exhibit 9-4.A school teacher is worried that the concentration of dangerous,cancer-causing radon gas in her classroom is greater than the safe level of 4pCi/L.The school samples the air for 36 days and finds an average concentration of 4.4pCi/L with a standard deviation of 1pCi/L. Refer to Exhibit 9-4.In order to test whether the average level of radon gas is greater than the safe level,the appropriate hypotheses are ____________.

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Definitions:

General Adaptation Syndrome

A triphasic reaction (comprising alarm, resistance, and exhaustion stages) to stress experienced by the body.

Viral Infections

Diseases caused by viruses, microscopic organisms that invade living cells and replicate, often leading to illness.

Bacterial Infections

Diseases caused by harmful bacteria which can lead to various health problems, depending on the area of the body affected.

T Lymphocytes

A form of white blood cell crucial for cell-mediated immune responses.