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The Internal Revenue Service claims that the mean wait time for callers during a recent...

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The Internal Revenue Service claims that the mean wait time for callers during a recent tax filing season was less than 7 minutes. A random sample of 11 callers had a mean wait time of 6.7 minutes and a standard deviation of 3.2 minutes. Does the data support the idea that the wait time was less than 7 minutes. Use a 5% level of significance.

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