The quality-control manager at a light emitting diode (LED) factory needs to determine whether the mean life
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The quality-control manager at a light emitting diode (LED) factory needs to determine whether the mean life of a large shipment of LEDs is equal to 50,000 hours. The population standard deviation is 1,500 hours. A random sample of 64 LEDs indicates a sample mean life of 49,875 hours.
a. At the 0.05 level of significance, is there evidence that the mean life is different from 50,000 hours?
b. Compute the p-value and interpret its meaning.
c. Construct a 95% confidence interval estimate of the population mean life of the LEDs.
d. Compare the results of (a) and (c). What conclusions do you reach?
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a Minitab Output H 0 50000 The mean life of a large shipment of LEDs is equal to 50000 hours H 1 500...View the full answer
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Related Book For 
Basic Business Statistics Concepts And Applications
ISBN: 9780134684840
14th Edition
Authors: Mark L. Berenson, David M. Levine, Kathryn A. Szabat, David F. Stephan
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