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Find the lower bound of the 95 confidence interval for the

Light Bulbs invented estimate mean lifetime. A simple random sample of 12 bulbs had a sample mean lifetime of 620 hours with a sample standard deviation of 69 hours. The population is approximately normal. Find the lower bound of the 95% confidence interval for the population mean lifetime of all bulbs manufactured by the new process.

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Business Management: Find the lower bound of the 95 confidence interval for the

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