Collect a sample composed of at least 20 measurements from the process in question. Find the average and standard deviation of the sample. Add three times the standard deviation to the average to get the upper control limit. Subtract three times the standard deviation from the average to get the lower control limit.
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Answer:
formula of upper limit and lower limit :-
Collect a sample composed of at least 20 measurements from the process in question. Find the average and standard deviation of the sample. Add three times the standard deviation to the average to get the upper control limit. Subtract three times the standard deviation from the average to get the lower control limit.
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Answer:
Find the average and standard deviation to the sample.Add three times the standard deviation to the average to get the upper control limit. Subtract three times the standard deviation from the average to get the lower control limit.