Question: 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

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 126 hours. A random sample of 81 light bulbs indicated a sample mean life of 440 hours.

a. Construct a 95% confidence interval estimate for the population mean life of light bulbs in this shipment.The 95%

confidence interval estimate is from a lower limit of enter your response here hours to an upper limit of enter your response here hours.

(Round to one decimal place as needed.)

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