A tire manufacturer claims (based on years of experience with its tires) that the mean mileage of

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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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Elementary Statistics

ISBN: 9780538733502

11th Edition

Authors: Robert R. Johnson, Patricia J. Kuby

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