We want an estimate of the mean time required for ships of a particular class to cross the Pacific Ocean from San Francisco to Tokyo. Little is known about the distribution of the mean time for this class of ships to cross the ocean due to the age variation of the ships. It is believed, however, the travel time is not normally distributed. From a sample of the logs of 49 ships, randomly selected, we observe the times shown in the data sets Ships.

Question

We want an estimate of the mean time required for ships of a particular class to cross the Pacific Ocean from San Francisco to Tokyo.  Little is known about the distribution of the mean time for this class of ships to cross the ocean due to the age variation of the ships. It is believed, however, the travel time is not normally distributed. From a sample of the logs of 49 ships, randomly selected, we observe the times shown in the data sets Ships.

For your convenience, dataset Ships are located on Blackboard under 
¡¥Quizzes and Tests¡¦.  Additionally, the information is also shown in Table 1 at the end of this test.

With ƒÑ = 0.10, construct a confidence interval estimate of ƒÝ, the mean time for all ships of this class.

Which distribution did you use (t or unit normal (Z))? _________________

ANSWER: I am ______% confident that

__________________________________________
                              (enter interval estimate)

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