Mathematics, 21.04.2020 02:04 jhony42
A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 732 hours. A random sample of 28 light bulbs has a mean life of 704 hours. Assume the population is normally distributed and the population standard deviation is 65 hours. At alphaequals0.05, do you have enough evidence to reject the manufacturer's claim?
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A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least...
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