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Bridget wants to study how sixth graders perform in math exams. She obtains a list of all the districts in the state, randomly selects 15

Bridget wants to study how sixth graders perform in math exams. She obtains a list of all the districts in the state, randomly selects 15 percent of the districts, and administers achievement tests to all eighth graders in these districts. Which sampling method is she using? a. haphazard sampling b. quota sampling c. cluster sampling d. stratified random sampling

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