POPs Such as Dioxins and PCB's Are Transported into Arctic

question 44

Multiple Choice

POPs such as dioxins and PCB's are transported into arctic ecosystems and food chains by

• A)global air patterns and then deposited on snow from where they enter streams and plankton.
• B)being eaten by fish when toxic materials are dumped into oceans.
• C)local industries run by native people which use toxic chemical processes.
• D)ocean currents which contaminate local streams.

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Definitions:

Sample Size

The number of observations or data points that are selected from a larger population for the purpose of statistical analysis.

Sample Proportion

The ratio of members in a sample that have a particular attribute to the total number of members in that sample.

Test Statistic

A value calculated from sample data during a hypothesis test that determines whether to reject the null hypothesis.

Approximately Normal

Describes data that roughly follows a normal distribution, though it may not perfectly fit the normal curve.