Mathematics, 14.11.2019 20:31 danyelleearly12
1. the quality control manager at a light-bulb factory needs to estimate the mean life of a new type of light-bulb. the population standard deviation is assumed to be 60 hours. a random sample of 32 light-bulbs shows a sample mean life of 490 hours. construct and explain a 95% confidence interval estimate of the population mean life of the new light-bulb.
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