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A company claims that the standard deviation in their delivery time is less than 5 days. A sample of 27 past customers is taken. The

A company claims that the standard deviation in their delivery time is less than 5 days. A sample of 27 past customers is taken. The average delivery time in the sample was 14 days with a standard deviation of 4.5 days. At 95% confidence, test the company's claim. Use the critical value approach.

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