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A researcher wants to ensure that a study on school uniforms includes a proportional number of students from each grade level. They divide the student body into grades 9, 10, 11, and 12, then randomly select participants from each grade. What is this sampling method called?
A researcher wants to ensure that a study on school uniforms includes a proportional number of students from each grade level. They divide the student body into grades 9, 10, 11, and 12, then randomly select participants from each grade. What is this sampling method called?