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(All Steps) A manufacturer claims that his television will have an average lifetime of at least five years. The standard deviation is seven months. 81 televisions

Question: A manufacturer claims that his television will have an average lifetime of at least five years. The standard deviation is seven months. 81 televisions are selected at random, and their average lifetime was found to be 59 months. Is the manufacturer correct? Use \(\alpha =0.025\)

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