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 108 hours. A random sample of 64 light bulbs indicated a sample mean life of 330 hours. Complete parts​ (a) through​ (d) below.       Question content area bottom Part 1 a. Construct a 99​% confidence interval estimate for the population mean life of light bulbs in this shipment.   The 99​% confidence interval estimate is from a lower limit of enter your response here hours to an upper limit of enter your response here hours.

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