Question: A test engineer samples 12 diapers from a certain manufacturing process and respectively records 12, 11, 14, 13, 9, 6, 10, 7, 4, 8, 5,

A test engineer samples 12 diapers from a certain manufacturing process and respectively records 12, 11, 14, 13, 9, 6, 10, 7, 4, 8, 5, and 10 defects. What are the c-Chart control limits for a 2-sigma level? Is the process in control?

A.

UCLc = 15.11, LCLc = 3.06; process is in control

B.

UCLc = 18.12, LCLc = 0.04; process is in control

C.

UCLc = 15.11, LCLc = 3.06; process is out of control

D.

UCLc = 18.12, LCLc = 0.04; process is out of control

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