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For their class project, a group of Business students de- cides to survey the student body to assess opinions about a proposed new student coffee shop to judge how successful it might be. Their sample of 200 contained 50 first-year students, 50 sophomores, 50 juniors, and 50 seniors. a) Do you think the group was using an SRS? Why? b) What kind of sampling design do you think they used? 6.
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Answer #1

(a) The group was not using Simple Random Sampling (SRS). In SRS, each possible sample is equally likely. Here, the population of students is divided into 4 groups: (i) first year students, (ii) sophomores, (iii) juniors and (iv) seniors. A random sample is taken from each group.

(b) They used Stratified Random Sampling Design. The 4 strata are the 4 groups given above.

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