Discuss difference between variables and attributes data

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Reference no: EM133893060

Questions

1. Discuss the difference between assignable cause variation and common cause variation.

2. Discuss the difference between variables and attributes data.

3. Discuss how it is possible for a process to be in control and yet produce a large percentage of nonconforming product.

4. Discuss the difference between a Type I error and a Type II error.

5. Under what circumstances might it be more appropriate to use 2 sigma control limits on a control chart rather than 3 sigma limits?

6. Discuss what the term "out of control" means.

7. How does a control chart signal that the process being monitored may be out of control?

8. When is it preferable to use an attributes control chart instead of a variables control chart?

9. What is the difference between the p-chart and the np-chart?

10. What are the circumstances that require the use of Cpk rather than Cp as a measure of process capability?

11. Under what circumstances would Cp and Cpk be the same?

12. How does a delta chart differ from an x-bar chart? Under what conditions should a delta chart be used instead of an x-bar chart?

13. When should an s-chart be used instead of a range chart?

14. What is the appropriate control chart(s) to use to track the number of gallons of gasoline produced on a daily basis in a petroleum refinery?

15. Does being in control always mean that a process is producing few defective items?

16. What would be some possible explanations for a rising trend on an x-bar chart used to monitor moisture content in product emerging from a drying oven?

17. How might shift-to-shift variation in the set-up of a process manifest itself in a control chart?

Reference no: EM133893060

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