SOLUTION: A quality engineer in a light bulb factory is planning a study to estimate the average life of a large shipment of light bulbs. The engineer wants to estimate the average life with
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Question 852607: A quality engineer in a light bulb factory is planning a study to estimate the average life of a large shipment of light bulbs. The engineer wants to estimate the average life within plus or minus 15 hours with 95 percent confidence. Assuming a process standard deviation of 100 hours, determine the sample size for this study Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A quality engineer in a light bulb factory is planning a study to estimate the average life of a large shipment of light bulbs. The engineer wants to estimate the average life within plus or minus 15 hours with 95 percent confidence. Assuming a process standard deviation of 100 hours, determine the sample size for this study
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Since ME = zs/sqrt(n)
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n = [zs/E]^2
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Your Problem::
n = [1.96*100/15]^2 = 171 when rounded up
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Cheers,
Stan H.
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