Question: Following the initial Persian Gulf War, the Pentagon changed its logistics processes to be more corporate-like. The extravagant just-in-case mentality was replaced with just-in-time systems.

Following the initial Persian Gulf War, the Pentagon changed its logistics processes to be more corporate-like. The extravagant "just-in-case" mentality was replaced with "just-in-time" systems. Emulating FedEx and United Parcel Service, deliveries from factories to foxholes are now expedited using bar codes, laser cards, radio tags, and databases to track supplies. The table below contains order-to-delivery times (in days) for a sample of shipments from the United States to the Persian Gulf and a sample of shipments to Bosnia.

a. Is there sufficient evidence to indicate that the variances in order-to-delivery times for Persian Gulf and Bosnia shipments differ? Use Î± = .05.
b. Given your answer to part a, is it appropriate to construct a confidence interval for the difference between the mean order-to-delivery times? Explain.

Persian Gulf Bosnia 28.0 20.0 26.5 10.6 9.1 35.2 29.1 41.2 27.5 15.1 6.4 5.0 11.4 6.5 6.5 3.0 7.0 5.5

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