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Control Charts

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, UCL r= 1.141, LCLr = 0. Over the past few days, they have taken five random samples of four loaves each and have found the following:

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 this process still in Control? Explain why or why not?

Solution Summary

The solution describes the determination of the control limits of x-bar and R chart.

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