Question: Michelin Tires would like to estimate the average tire life
Michelin Tires would like to estimate the average tire life of its Latitude Tour tire in terms of how many miles it lasts. Determine the sample size needed to construct a 98% confidence interval with a margin of error equal to 2,000 miles. Assume the standard deviation for the tire life of this particular brand is 8,000 miles. Verify your result using PHStat.
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