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At Dataville secondary school, there are: 250 grade 9 students, 200 grade 10 students, 150 grade 11 students, and 225 grade 12 students. Design each

At Dataville secondary school, there are: 250 grade 9 students, 200 grade 10 students, 150 grade 11 students, and 225 grade 12 students. Design each of the following sampling methods. (4 marks)

a) A simple random sample.

b) Multi-stage random sample.

please provide all steps thank you.

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