A survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior and senior classes last semester. What sampling method was used?

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  1. There are many different types of sampling methods. Check them out and see which one closely fits your scenario.

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  2. Let smokers =A.
    Gum chewers=B
    n(AuB)= n(A) + n(B) -n(AnB).
    100 + 150 - 75
    neither =400-175=225

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