Posted by **Jasmine** on Sunday, March 25, 2012 at 2:44am.

How long does it take to have food delivered? A Chinese restaurant advertises that the mean delivery will be no more than 30` minutes. A random sample of delivery times is shown below. Based on this sample data, is the mean delivery time different than 30 minutes? Use a 5% level of significance. 21, 28, 22, 23, 30, 27, 29, 30, 32, 24, 32, 25, 26, 31.

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