A cell phone company wants to determine the average amount of data that their smart phone customers use each month. Which group would best represent a sample of the population?

A representative sample should include customers from the population the company wants to study without selecting them based on a factor that could affect data use. Customers with a current smartphone data plan are the relevant population, so a sample of one thousand of them is the best choice. The other groups are selected for reasons—technical support calls, expensive plans, or recent sign-ups—that may make their data use different from the average.

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