A courier service advertises that its average delivery time is less than six hours for local deliveries. A random sample of the amount of time this courier takes to deliver packages to an address across town produced the following times (rounded to the nearest hour).                     7, 3, 4, 6, 10, 5, 6, 4, 3, 8 Is there sufficient evidence to support the courier’s advertisement at the 5% level of significance?

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