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Question 5 = A random sample of 105 light bulbs had a mean life of 441 hours with a population standard deviation of =
Question 5 = A random sample of 105 light bulbs had a mean life of 441 hours with a population standard deviation of = 40 hours. Construct a 90% confidence interval for the mean life, u, of all light bulbs of this type.
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Basic Business Statistics Concepts And Applications
Authors: Mark L. Berenson, David M. Levine, Timothy C. Krehbiel
12th Edition
132168383, 978-0132168380
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