# Question

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 specific situation.

## Answer to relevant Questions

A process is controlled with a fraction nonconforming control chart with three-sigma limits, n = 100, UCL = 0.161, center line = 0.080, and LCL = 0. (a) Find the equivalent control chart for the number nonconforming. (b) Use ...A control chart for fraction nonconforming indicates that the current process average is 0.03. The sample size is constant at 200 units. (a) Find the three-sigma control limits for the control chart. (b) What is the ...Construct a standardized control chart for the data in Exercise 7.29. In Exercise 7.29 The fraction nonconforming control chart in Exercise 7.3 has an LCL of zero. Assume that the revised control chart in part (b) of that exercise has a reliable estimate of the process fraction nonconforming. What sample size ...Consider the paper-making process in Exercise 7.49. Set up a u chart based on an average sample size to control this process. In Exercise 7.49Post your question

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