The manager of a popular restaurant wants to know what types of vegetarian dishes people prefer to eat. Which sample would provide the most accurate data?

A random group is more likely to represent a variety of people than a group chosen from one specific setting. Surveying 40 people also gives more data than surveying 5 or 10. The random group of 40 people on the street is therefore the best choice; the hamburger stand and cookout groups may be biased toward particular people.

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