Homework Answers Ch 9A e12

Homework Answers Ch 9A e12 - CHAPTER 9A PROCESS CAPABILITY...

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CHAPTER 9A PROCESS CAPABILITY AND SPC Review and Discussion Questions 1. The capability index allows for some drifting of the process mean. Discuss what this means in terms of product quality output. When C pk is larger then 1.33 or 1.5, this means that the mean of the process can drift (up to a limit) while still producing within specifications. This is what is implied by the phrase “a capable process." 2. Discuss the purposes and differences between the P-charts and X-bar and R charts. P-charts are used to monitor the process for attribute data. These are typically binomial “go, no-go” data. An example of a P-chart is percent of pieces nonconforming. X-bar charts are used for charting population values for continuous measurement. X-bar charts operate effectively with smaller sample sizes than P-charts, but it is more involved to analyze the sample for an X-bar chart since a measurement must be taken. A rule of thumb for the sample size of a P-chart is to have at least one defective in each sample. This can require a
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This note was uploaded on 01/05/2012 for the course COMMERCE 398 taught by Professor Dale during the Spring '11 term at UBC.

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Homework Answers Ch 9A e12 - CHAPTER 9A PROCESS CAPABILITY...

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