Zander wants to find out what the most popular sporting event is in the district’s high schools. He surveys a sample of the population. Under which condition is surveying a sample valid?

A sample is useful when the population is large or diverse, because surveying every person would be difficult. To represent the district’s high schools fairly, Zander should choose a sample that reflects the variety of people in the population. The condition that the population contains a large, diverse group of people makes surveying a sample valid.

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