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Which of the following is a good example of a representative sample?

To get an idea about American views on immigration, you poll random individuals at the Republican National Convention.

An anonymous survey is provided to all sophomores to learn more about cheating amongst high school students.

You use a computer program to randomly dial numbers in the phone book to respond to your poll about phone services.

You request that a local Baptist church distribute your survey investigating American family values.

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pkmnmushy
Here the answer will be the third option. The first one is not a good representative sample because the Republican National Convention members are not a good representation of Americans as a whole. The second one will only tell you what sophomores think/do/perceive about cheating, not high school students as a whole. And the last one is also not a good representation of American family values, because not all Americans are Baptists. So the answer is the third one