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A manufacturer claims that his television will have an average lifetime of more than 60 months....

A manufacturer claims that his television will have an average lifetime of more than 60 months. The standard deviation is seven months. Eighty-one televisions are selected at random, and their average lifetime was found to be 62 months. Is the manufacturer correct? Use α=0.01
*Hypothesis test
Math   Statistics-And-Probability   
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