The data in Table 7E.5 represent the results of inspecting all units of a personal computer produced for the last 10 days. Does the process appear to be in control?
Answer to relevant QuestionsBased on the data in Table 7E.8 if an np chart is to be established, what would you recommend as the center line and control limits? Assume that n = 500. Do points that plot below the lower control limit on a fraction nonconforming control chart (assuming that the LCL > 0) always mean that there has been an improvement in process quality? Discuss your answer in the context of ...(a) A control chart for the number nonconforming is to be established, based on samples of size 400. To start the control chart, 30 samples were selected and the number nonconforming in each sample determined, yielding. (b) ...A process has an in-control fraction nonconforming of p = 0.02. What sample size would be required for the fraction nonconforming control chart if it is desired to have a probability of at least one nonconforming unit in the ...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 ...
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