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Case: Delta Plastics, Inc. (B)

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CASE: Delta Plastics, Inc. (B)

By Sarah Wolfe

ITT

Have you taken the time to look at your plastic containers? Well, if you do there is a chance that your containers have flaws and defects that are noticeable to the human eye. There are defects that do not get in the way of using the containers but for quality purposes, it still is a defect.

Case Questions
1. Prepare a 3- sigma control chart for both production processes, using the new and standard (use the quality report in Delta Plastics, Inc. Case A, Chapter 5). Are both processes in control? What can you conclude?
2. Are both materials equally subject to the defects?
3. Given your findings, what advice would you give Jose?

1. Prepare a 3- sigma control chart for both production processes, using the new and standard (use the quality report in Delta Plastics, Inc. Case A, Chapter 5). Are both processes in control? What can you conclude?
a. The control data is based on a chart showing the type of defect as well as the number of defects for one month, a total of 20 days. The average number of defects for the standard material is 1.93 and the range is 2.6. The control limit is 2.41, the upper control limit is 3.28 and the lower control limit is .571. The average number of defects for the new material is 2.44 and the range is 4.55. The control limit is 2.41, upper control limit is 4.14 and the lower control limit is -1.73.
b. I tried to put the statistics together to have an overall perspective of the defects since most of them fall in the category of attributes rather than variables. I then took into consideration the 20 days as the period of observation rather than the four weeks. A P-chart methodology would rightly describe the products presented as good or bad because it is not a quick fix quality management system. After developing

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