Car Ages 4 08 11 14 3443 58337 46 6182 15 11 4 1618 843 36 11 7 7695 10 8 434 Taxi Ages 880
In Exercises 5–20, assume that the two samples are independent simple random samples selected from
Car and Taxi Ages When the author visited Dublin, Ireland (home of Guinness Brewery employee William Gosset, who first developed the t distribution), he recorded the ages of randomly selected passenger cars and randomly selected taxis. The ages can be found from the license plates. (There is no end to the fun of traveling with the author.) The ages (in years) are listed below. We might expect that taxis would be newer, so test the claim that the mean age of cars is greater than the mean age of taxis.
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