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Center Line and Control Limits

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500 units, randomly chosen from an assembly line, are inspected each day and the number of defective are recorded.

22 33 24 20 18 24 24 29 18 27 31 46 31 24 22

a. Find the center line and the control limits for this process.
b. Does the process appear to be in control? Why?

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Solution Summary

The center line and control limits is examined.

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Please see the attached documents for full solutions.

a. The control limits of p charts are given by
LCL = p - 3 * sqrt [p(1-p)/n]
Central Line = p
UCL = p + 3* sqrt [p(1-p)/n]

p Chart Summary:
Intermediate ...

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