Question: A tire manufacturer claims based on years of experience with

A tire manufacturer claims (based on years of experience with its tires) that the mean mileage of its tires is 35,000 miles and the standard deviation is 5000 miles. A consumer agency randomly selects 100 of these tires and finds a sample mean of 31,000. Should the consumer agency doubt the manufacturer’s claim?

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  • CreatedAugust 28, 2015
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