er of Christmas light bulb claims that the average life of its product will exceed 40 hours. A company is willing to buy large quantities of bulbs if the claim is true. A random sample of 56 light bulbs is tested, and is found that the sample mean is 45 hours. If the population has a standard deviation of 5 hours, is it likely that bulb will be bought? a = 10% Formulate the Null hypothesis. -what is your ta

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