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A company claims that the mean battery of their MP3 Player is at least 40hours. You suspect his claim is incorrect and find that a

A company claims that the mean battery of their MP3 Player is at least 40hours. You suspect his claim is incorrect and find that a random sample of 18 MP3 players has a mean battery of 38.5 hours and a standard deviation of 1.7 hours.Is there enough evidence to reject the claim?=0.01

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