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Identify and justify which type of sampling (random, stratified, systematic, cluster, convenience) is used in the following examples.

a) A market researcher polls 50 people at a local shopping mall.

b) To avoid working late, a control analyst simply inspects the first 100 items produced in a day.

c) A pollster uses a computer to generate 500 random numbers, then interviews the voters corresponding to those numbers.

d) A tax auditor selects every 1000th income tax return that is received.

e) A market researcher selects 500 people from each of 10 cities.

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Statistics and Probability, Statistics

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