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3-sigma c-chart

Automobiles are randomly selected for a close examination for fit and finish defects including such items as dirt speck in the paint and panels that are not properly aligned. Based on data collected for the following vehicles that were so inspected construct a 3-sigma c-chart, then reach a conlcusion regarding whether the process is in control.

Vehicle c = Number Vehicle c = Number
Number of Defects Number of Detects

1 4 11 6
2 7 12 10
3 4 13 5
4 9 14 10
5 9 15 7
6 8 16 6
7 7 17 8
8 6 18 5
9 7 19 7
10 5 20 11

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