A paper mill uses a control chart to monitor the imperfection in finished rolls of paper. Production output is inspected for 20 days, and the resulting data are shown in Table 6E.10. Use these data to set up a control chart for nonconformities per roll of paper. Does the process appear to be in statistical control? What center line and control limits would you recommend for controlling current production?
Answer to relevant QuestionsConsider the papermaking process in Exercise 6.15. Set up a u chart based on an average sample size to control this process. In exercise Consider the data in Exercise 6.18. Suppose a new inspection unit is defined as 2,500 meters of wire. In exercise a. What are the center line and control limits for a control chart for monitoring future production based on ...Kittlitz (1999) presents data on homicides in Waco, Texas, for the years 1980-1989 (data taken from the Waco Tribune-Herald, December 29, 1989). There were 29 homicides in 1989. Table 6E.15 gives the dates of the 1989 ...A process produces rubber belts in lots of size 2,500. Inspection records on the last 20 lots reveal the data in Table 6E.5. a. Compute trial control limits for a fraction nonconforming control chart. b. If you wanted to ...a. Derive an item-by-item sequential-sampling plan for which p1 = 0.01, α = 0.05, p2 = 0.10 and β = 0.10. a. Draw the OC curve for this plan.
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