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A courier service advertises that its average delivery time is more than 1 5 hours for local delivery. A random sample of times for 12

A courier service advertises that its average delivery time is more than 15 hours for local delivery. A random sample of times for 12 deliveries to an address across town was recorded. These data are shown here. Is this sufficient evidence to support the courier advertisement at the 1% level of significance.

15.03

16.33

16.5

15.22

16.56

16.76

17.98

18.82

17.96

14.54

15.09

16.46

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