A local pizza restaurant located close to a college campus advertises that their delivery time to a college dormitory is less than for a local branch of a national pizza chain. In order to determine whether this advertisement is valid, you and some friends have decided to order 10 pizzas from the local pizza restaurant and 10 pizzas from the national chain, all at different times. The delivery times in minutes are shown in the following table (Use α = 0.05).

Local 16.8 11.7 15.6 16.7 17.5 18.1 14.1 21.8 13.9 20.8

chain 22.0 15.2 18.7 15.6 20.8 19.5 17.0 19.5 16.5 24.0

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