Mathematics, 19.07.2019 23:30 hella33revj

Amanufacturer of light bulbs advertises that, on average, its long-life bulb will last more than 4800 hours. to test this claim, a statistician took a random sample of 96 bulbs and measured the amount of time until each bulb burned out. the mean lifetime of the sample of bulbs is 4825 hours and has a standard deviation of 320 hours. can we conclude with 90% confidence that the claim is true?

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Amanufacturer of light bulbs advertises that, on average, its long-life bulb will last more than 480...