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What is the probability that the student will be a freshman

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Reference no: EM132168165

An upper-level sociology class has 120 registered students: 34 seniors, 57 juniors, 22 sophomores, and 7 freshmen.

a. Imagine that you choose one random student from the classroom (perhaps by using a random number table). What is the probability that the student will be a junior.

b. What is the probability that the student will be a freshman.

c. If you are asked to select a proportionate stratified sample of size 30 from the classroom, stratified by class level (senior, junior, etc.), how many students from group will there be in the sample?

d. If instead you are to select a disproportionate sample of size 20 from the classroom, with equal numbers of students form each class level in the sample, how many freshmen will there in the sample?

Reference no: EM132168165

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