Determine c-chart two-sigma upper and lower control limits

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Reference no: EM132272146

At Webster Chemical Company, lumps in the caulking compound could cause difficulties in dispensing a smooth bead from the tube. Even when the process is in control, an average of four lumps per tube of caulk will remain. Testing for the presence of lumps destroys the product, so an analyst takes random samples. The following results are obtained:

Tube No. Lumps Tube No. Lumps Tube No. Lumps

1 6 5 6 9 5

2 5 6 4 10 0

3 0 7 1 11 9

4 4 8 6 12 2

Determine the c-chart two-sigma upper and lower control limits for this process. Is the process in statistical control?

Reference no: EM132272146

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