In: Statistics and Probability
*please use excel and provide the formulas
Acme Systems, Inc. produces a very large volume of plastic rods on a regular basis. These rods require an extremely accurate diameter. Thus, the Quality Control manager wants to know if the production process is producing rods at a consistent diameter. 220 rods have been sampled each day for 10 days. Defects have been recorded. Develop a “p” control chart for the proportion of defects across the 10 days. Assume Z = 2.58. Do any of the rods appear to be “out of control”? Comment on your findings.
Day | Defects |
1 | 12 |
2 | 29 |
3 | 18 |
4 | 10 |
5 | 14 |
6 | 22 |
7 | 7 |
8 | 23 |
9 | 9 |
10 | 10 |
please check the excel worksheet
as we can see there is only day 2 which have proportion value greater than upper control limit
now showing formula