A fraction nonconforming control chart with center line 0.10, UCL = 0.19, and LCL = 0.01 is
Question:
(a) If three-sigma limits are used, find the sample size for the control chart.
(b) Use the Poisson approximation to the binomial to find the probability of type I error.
Using the Poisson approximation to the binomial, = np = 100(0.10) = 10.
(c) Use the Poisson approximation to the binomial to find the probability of type II error if the process fraction defective is actually p = 0.20.
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Related Book For 
Introduction to Statistical Quality Control
ISBN: 978-1118146811
7th edition
Authors: Douglas C Montgomery
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