To have a reasonable estimate of NOx emissions from a
Chapter , Problem 6.66(choose chapter or problem)
To have a reasonable estimate of NOx emissions from a boiler, the exhaust is tested 15 times. The mean value of the emissions is 25 ppm (parts per million) and the standard deviation is 3 ppm. Determine a 95% confidence interval for the standard deviation of the NOx emissions from the boiler.
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