A banking center has instituted a process improvement program to reduce and hopefully eliminate errors in their check processing operations. The current error rate is 0.01. The initial objective is to cut the current error rate in half. What sample size would be necessary to monitor this process with a fraction nonconforming control chart that has a non-zero LCL? If the error rate is reduced to the desired initial target of 0.005, what is the probability of a sample nonconforming from this improved process falling below the LCL?
Answer to relevant QuestionsA fraction nonconforming control chart has center line 0.01, UCL = 0.0399, LCL = 0, and n = 100. If three-sigma limits are used, find the smallest sample size that would yield a positive lower control limit. The following fraction nonconforming control chart with n = 100 is used to control a process: UCL = 0.0750; Center line = 0.0400; LCL = 0.0050 (a) Use the Poisson approximation to the binomial to find the probability of a ...Consider the paper-making process in Exercise 7.49. Set up a standardized u chart for this process. In Exercise 7.49 Find the three-sigma control limits for (a) a c chart with process average equal to nine nonconformities. (b) a u chart with c = 16 and n = 4. A textile mill wishes to establish a control procedure on flaws in towels it manufactures. Using an inspection unit of 50 units, past inspection data show that 100 previous units had 850 total flaws. What type of control ...
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