A random sample of 18 three-year-old Chevrolet Impalas was obtained in the St. Louis, Missouri area, and the number of miles on each car was recorded as follows:

Test the hypothesis that the median number of miles on three year-old Impalas is less than 40,428 miles, the median miles driven over three years nationwide, at the a = 0.05 level of significance.

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67476 38,194 45,109 35,874 29,949 26,199 39,943 36,231 60,798 55,702 67,097 27,647 30,858 31,832 25,672 31,739 32,707 66,592