Suppose That a Biologist Took Water Samples at Random Intervals

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.