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A tire manufacturer would like to estimate the average tire life of its newall-season light truck tire in terms of how many miles it lasts.
A tire manufacturer would like to estimate the average tire life of its newall-season light truck tire in terms of how many miles it lasts. Determine the sample size needed to construct a 99% confidence interval with a margin of error equal to 1,900 miles. Assume the standard deviation for the tire life of this particular brand is 7,500 miles.
The sample size needed is
nothing
.
(Round up to the nearestinteger.)
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