Delivery time. A courier service manager is advertising that the average delivery time for his company is

Question:

Delivery time. A courier service manager is advertising that the average delivery time for his company is less than 10 hours for local deliveries. The manager records the delivery times for a random sample of 30 deliveries across town and gets a t-statistic of -20.

a) Explain what the t-statistic means in this context.

b) How many degrees of freedom are associated to the t-statistic? Find the 0.005 lower critical value for this t-statistic, and state your conclusion about the delivery times.

c) Why did you probably not need to find the lower critical value in

b) to reach your conclusion?

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