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(Steps Shown) City Opera, a local opera company, wishes to take a sample of its subscribers to learn the average number of years people have been subscribing.

Question: City Opera, a local opera company, wishes to take a sample of its subscribers to learn the average number of years people have been subscribing. The director of research expects the average to be 12 years and believes the standard deviation will be about 2 years (approximately one-sixth of the range). She wishes to be 95 percent confident of an estimate to be made from a mail survey. What sample size is required? Explain.

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