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Question 23 212 pts (CD?) A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least T20

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Question 23 212 pts (CD?) A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least T20 hours. A random sample of 51 light bulbs as a mean of T103 hours with a standard deviation of 62 hours. At an u=0.5, can you support the company's claim using the test statistic

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