Reference no: EM133500642

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?