Crews of Commercial Airlines Are Exposed to a Higher Level

question 40

Multiple Choice

Crews of commercial airlines are exposed to a higher level of background cosmic radiation during flight time than they would receive on the ground. A single round-trip, coast-to-coast flight gives a dose of about 0.012 rems. If a stewardess made 200 such flights in one year, how would her annual dose compare with a normal annual exposure on the ground of 3.6 mSv? (100 rem = 1 Sv)

• A) About the same.
• B) A bit less than 10 times more.
• C) A bit larger than 10 times more.
• D) A bit less than 100 times more.
• E) A bit larger than 100 times more.

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Definitions:

Statistic

A single measure, calculated from sample data, used to summarize a characteristic of the sample.

Parameter

A characteristic or measure that can define or summarize a particular aspect of a statistical population or model.

Estimation

The process of finding an approximate value of some parameter—such as a mean or proportion—of a population, based on random sample data.

Population Parameters

Numeric values that summarize and describe characteristics of an entire population, such as mean, variance, or proportion.