Dogsled drivers, known as mushers, use several different breeds of dogs to pull their sleds. One proponent of Siberian Huskies believes that sleds pulled by Siberian Huskies are faster than sleds pulled by other breeds. He times 4747 teams of Siberian Huskies on a particular short course, and they have a mean time of 5.45.4 minutes. The mean time on the same course for 4545 teams of other breeds of sled dogs is 6.66.6 minutes. Assume that the times on this course have a population standard deviation of 1.31.3 minutes for teams of Siberian Huskies and 1.91.9 minutes for teams of other breeds of sled dogs. Let Population 1 be sleds pulled by Siberian Huskies and let Population 2 be sleds pulled by other breeds.   Step 1 of 2 :   Construct a 99%99% confidence interval for the true difference between the mean times on this course for teams of Siberian Huskies and teams of other breeds of sled dogs. Round the endpoints of the interval to one decimal place, if necessary.

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