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r09 on its website (The Cincinnati Enquirer, January 7, 2010). According to a report by a ta advocate, callers using the new system can expect to wait on hold for an long time of 14 minutes before being able to talk to an IRS employee. Suppose you select a sample of 50 callers after the new phone service has dedde it is reasonable to assume that the standard deviation of waiting times is 10 minutes. Use α 0.05.
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