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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
Whole Grains LLC uses statistical process control to ensure that its health-conscious, low-fat, multigrain sandwich loaves have the proper weight. Based on a previously stable and in-control process, the control limits of the x- and R-charts are: UCLx = 6.56. LCLx = 5.84, UCLR = 1.141, LCLR = 0. Over the past few days, they have taken five random samples of four loaves each and have found the following:
| Â | Â |
Net Weight |
 |  |
|
Sample |
Loaf #1 |
Loaf #2 |
Loaf #3 |
Loaf #4 |
|
1 |
6.3 |
6.0 |
5.9 |
5.9 |
|
2 |
6.0 |
6.0 |
6.3 |
5.9 |
|
3 |
6.3 |
4.8 |
5.6 |
5.2 |
|
4 |
6.2 |
6.0 |
6.2 |
5.9 |
|
5 |
6.5 |
6.6 |
6.5 |
6.9 |
Is the process still in control? Explain why or why not.
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