A statistics student considered many methods for collecting data from adults to estimate support for lowering the voting age to 16 years old. Which of the following methods would be least likely to include sampling bias?

To estimate support among adults, the sample should represent adults broadly rather than a narrow or self-selected group. A random sample of 500 adults across the state gives people in the target population a chance to be selected, so it is least likely to have sampling bias. High school students are not a representative sample of adults, and mall visitors or people who choose to answer an online survey may differ from the wider adult population.

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