Mathematics, 10.12.2020 14:00, robert7248

A manufacturer claims that the life span of its tires is 50,000 miles and the standard deviation is 800 miles. You work for a consumer protection agency and you are testing this manufacturer tires. You select 100 tires at random and found that the sample mean life span is 49,715 miles. Use a 99% confidence interval to test the manufacturer's claim. Assume the life spans of the tires are normally distributed.

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A manufacturer claims that the life span of its tires is 50,000 miles and the standard deviation is...