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In a sample of 80 light bulbs, the mean lifetime was 1,217 hours with a standard deviation of 52.0 hours. An engineer claims that the

In a sample of 80 light bulbs, the mean lifetime was 1,217 hours with a standard deviation of 52.0 hours. An engineer claims that the mean lifetime is between 1,208 and 1,226 hours. With what level of confidence can this statement be made

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