From time to time, one branch office of a company must
Chapter 13, Problem 50E(choose chapter or problem)
From time to time, one branch office of a company must make shipments to another branch office in another state. Three package-delivery services operate between the two cities where the branch offices are located. Because the price structures for the three delivery services are quite similar, the company wants to compare the delivery times. The company plans to make several different types of shipments to its branch office. To compare the carriers, the company sends each shipment in triplicate, one with each carrier. The results listed in the accompanying table are the delivery times in hours.
a Is there evidence of a difference in mean delivery times among the three carriers? Give bounds for the attained significance level.
b Why was the experiment conducted using a randomized block design?
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