A student is doing a study on study habits. He needs a random sample of students from every grade level. What is a good way to do this?
A)
He could send a questionnaire to every student in Algebra I.
B)
He could put a questionnaire on all cars in the senior parking lot.
C)
He could send a questionnaire to every student in a senior English class.
D)
He could poll all students in a 9th grade, 10th grade, 11th grade, and 12th grade English class.
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