Question

The AAA market research company has a list of all prersons who have flown southwest airlines in the last yr. To sample these persons about their flying experience, AAAMRC decides to separate the population into 4 groups: 1) frequent (4or more trips)businesess travelers 2)infrequent(3or fewer trips) business travelers30frequent leisure travelers: and 4) infrequent leisure travelers and then randomly sample from each group AAAMRC is doing a
Simple random sample
Stratified random sample
Systematic random sample
Cluster random sample

Answer 1

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