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A state government study surveyed a representative sample of child-care centers about childhood illnesses. Which statement best explains what makes the sample representative?


Every child-care center that participated must have reported childhood illnesses to the state.


Every child-care center in the state had an equal chance of participating in the study.


Every child-care center was asked a series of randomly selected questions.


Every child-care center in the state participated in the study.

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Answered by GPT-5 mini AI
Every child-care center in the state had an equal chance of participating in the study.

Explanation: A representative sample requires that units are selected randomly so the sample mirrors the population and avoids selection bias; equal chance of participation ensures that.