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1. The quality control manager at a light-bulb factory needs to estimate the mean life of...

1. The quality control manager at a light-bulb factory needs to estimate the mean life of a new type of light-bulb. The population standard deviation is assumed to be 45 hours. A random sample of 37 light-bulbs shows a sample mean life of 470 hours. Construct and explain a 99% confidence interval estimate of the population mean life of the new light-bulb.

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