In a recent survey of students who graduated from a large public high school, nine out of ten students reported that they passed biology with a grade of seventy-five percent or higher. What further data could be produced to be sure that this information is accurate?

To check whether students accurately reported their biology grades, compare their answers with an official record. Reviewing school transcripts would show the grades students actually earned and verify whether they were at least 75%. Nearby schools, parents, or a previous graduating class would not confirm the grades of the surveyed students.

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