Suppose That a Biologist Took Water Samples at Random Intervals

question 10

Multiple Choice

Suppose that a biologist took water samples at random intervals from a rapidly flowing creek to test for contaminants. A sample was taken at a single location from the center of the creek for one year. Could such a survey be depended on?

• A) Yes, because contaminants in the creek would not change from day to day.
• B) No, because all the samples were taken from the center of the creek.
• C) No, because a sample must be taken every day.
• D) Probably.
• E) No, because all the samples were taken from a single location.

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