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The quality control manager at a light bulb factory needs to estimate the mean life of a large shipment of light bulbs. The standard deviation is 91 hours. A random sample of 49 light bulbs indicated a sample mean life of 360hours

1. Construct a 95% confidence interval estimate for the population mean life of light bulbs in this shipment (Round to one decimal place and show your equation)

2. Suppose that the standard deviation changes to 84 hours, construct a 95% confidence interval estimate just like in part 1 and show your equation again.

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