A quality control engineer believes that the life of light bulbs for his company is normally distributed
Question:
A quality control engineer believes that the life of light bulbs for his company is normally distributed with a standard deviation of 100 h. A random sample of 10 light bulbs gives the following information on the life of the light bulbs: 1.000 h; 1,200 h; 600 h; 400 h; 900 h; 500 h; 1,520 h; 1,800 h; 300 h; 525 h
(a) Find a 90 % confidence interval for the mean life of the light bulbs.
(b) Suppose the standard deviation is not known. Construct a 90 % confidence interval for the mean life of the light bulbs.
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Confidence Intervals for Light Bulb Life a Known Standard Deviation 100 h Assuming a normal distribution with a known standard deviation of 100 h we c...View the full answer
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Related Book For 
Statistics For Business And Financial Economics
ISBN: 9781461458975
3rd Edition
Authors: Cheng Few Lee , John C Lee , Alice C Lee
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