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4.(20 points). A company claims that the mean battery life of their cell phone is at least 5 hours and standard deviation of 0.5 hours.
4.(20 points). A company claims that the mean battery life of their cell phone is at least 5 hours and standard deviation of 0.5 hours. You inspect this claim and find that a random sample of 25 cell phone Has a mean battery life of 4.8 hours.is there enough evidence to reject the claim at a = 0.04
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