Question: The quality control manager at a light bulb factory needs to estimate the average life of a large shipment of lightbulbs. The process standard deviation

The quality control manager at a light bulb factory needs to estimate the average life of a large shipment of lightbulbs. The process standard deviation is known to be 100hours. A random sample of 25 light bulbs indicated a sample average life of 325 hours.

Set up a 90% confidence interval estimate of the true average life of light bulbs in this shipment.Round your z or tvalue to 3 decimal places.

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