A researcher is interested in evaluating a certain brand of
radial auto tire. Twenty tires are randomly selected from retail
outlets throughout the country, and each is placed on a special
machine which rotates the tires at a constant speed (equivalent to
55 miles per hour) against the friction equivalent of a 4000 pound
auto being driven on a smooth highway. Each tire is run until there
is no tread left. The number of miles (in thousands) were as
follows: 40, 30, 32, 35, 39, 35, 31, 36, 37, 35, 34, 35, 37, 34,
36, 38, 35, 36, 35, 36.
Estimate the population mean within a confidence interval of
.95.
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