Question: Will need all answers to problem The quality control manager at a lightbulb factory needs to estimate the mean life of a large shipment of

Will need all answers to problem The quality control manager at

Will need all answers to problem

The quality control manager at a lightbulb factory needs to estimate the mean life of a large shipment of lightbulbs. The process standard deviation is known to be 100 hours. A random sample of 64 lightbulbs indicated a sample mean life of 350 hours. Using this shipment, what is the 95% confidence interval estimate of the true population mean life of the lightbulbs? Provide answers to the following questions related to the confidence interval: Is it appropriate to use a z-value or a t-value in the calculation of the confidence interval? Type either z or t in the following blank: What is the correct z- or t-value to use in the calculation of the confidence interval estimate? Use the tables you were provided in class: Provide the confidence interval estimate values (give your answers to two decimal places):

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