Engine bearings depend on a film of oil to keep shaft and bearing surfaces separated. Samples are

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Engine bearings depend on a film of oil to keep shaft and bearing surfaces separated. Samples are regularly taken from production lines and each bearing in a sample is tested to measure the thickness of the oil film. After many samples, it is concluded that the population is normal. The variance is \(\sigma^{2}=0.012\) when the process is in control. A sample of size 25 is collected each week. The process will be declared out of control if the sample variance exceeds 0.020 . What is the probability that it will be declared out of control even though \(\sigma^{2}=0.012\) ?

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Probability And Statistics For Engineers

ISBN: 9780134435688

9th Global Edition

Authors: Richard Johnson, Irwin Miller, John Freund

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