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A college president wants to find out which courses are popular with students. What procedure would be most appropriate for obtaining an unbiased sample of students?

A. Survey a random sample of students from the English department.

B. Survey the first hundred students from an alphabetical listing.

C. Survey a random sample of students from a list of the entire student body.

D. Have students voluntarily mail in their preference.
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Examine each of the choices and make sure they satisfy the two conditions for an unbiased sample.

Eliminate $\mathrm{A}$ and $\mathrm{B}$ because they do not give every member of the population an equal chance of being chosen. (Only students in English or in the first hundred on the list have a chance.)

Eliminate D because not all students will mail their preference. (They may not be able to afford the postage, for example.)

The correct answer is $C$ It selects persons from the target population (students) and it gives every student an equal chance of being chosen.
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