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# Finding Upper Control and Lower control

Posted on 2013-05-30
Medium Priority
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How do I find the UCL and the LCL for the following data:
0.551
0.546
0.547
0.548
0.547
0.547
0.538
0.546
0.542
0.543
0.545
0.547
0.543
0.548
0.545
0.554
0.549
0.546
0.545
0.553
0.549
0.541
0.542
0.545
0.546
0.552
0.546
0.546
0.545
0.547
0.548
0.547
0.545
0.54
0.545
0
Question by:Jamie33

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ID: 39209824
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Accepted Solution

TommySzalapski earned 1000 total points
ID: 39210373
That link details it nicely. The only thing I would change is that I would say you should use the corrected sample standard deviation if you are calculating it from your data.
http://en.wikipedia.org/wiki/Standard_deviation#Corrected_sample_standard_deviation
If you calculated the biased standard deviation using the ehow link, then just take that result and multiply it by sqrt(N/(N-1)) to get the corrected sample standard deviation.
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