Not an SRS Its sometimes not practical to take a simple
Chapter 5, Problem 5.12(choose chapter or problem)
Not an SRS Its sometimes not practical to take a simple random sample. Heres an example that shows why. Suppose 1000 iPhones are produced at a factory today. Management would like to ensure that the phones display screens meet their quality control standards before shipping them to retail stores. Since it takes about 10 minutes to inspect an individual phones display screen, managers decide to inspect a sample of 20 phones from the days production. (a) Explain why it would be diffi cult for managers to inspect an SRS of 20 iPhones that are produced today. (b) An eager employee suggests that it would be easy to inspect the last 20 iPhones that were produced today. Why isnt this a good idea? (c) Another employee recommends inspecting every fi ft ieth iPhone that is produced. Explain carefully why this sampling method is not an SRS.
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