RE: PMHUB-G Control Limits, predefined by Definition?

Control limits are a calculated value based on the underlying data. It is
+/- 3 Standard Deviations from the mean and while the definition doesn't
change (always +/- 3 sigma) the actual distance from the mean will change,
depending on what the value of each sigma is.

I am in the Lagos, Nigeria airport right now and don't have access to my
latest PMBOK Guide to check the picture, but Google on Z tables
http://davidmlane.com/hyperstat/z_table.html and you can start to get an
idea that as the value of the standard deviations increases, the shape of
the normal distribution will change. (Flatten out and spread wider at the
sigma increases)

BR,
Dr. PDG, Lagos, Nigeria
http://www.build-project-management-competency.com

-----Original Message-----
From: pmhub@googlegroups.com [mailto:pmhub@googlegroups.com] On Behalf Of
Chris
Sent: Saturday, November 27, 2010 23:10
To: PMHUB - The largest PM group in Googlegroups!
Subject: PMHUB-G Control Limits, predefined by Definition?

Hi all,

I am wondering about whether the wording "control limits" means a
specific deviation from mean.

See PMBOK Guide p.430:
"Control Limits. The area composed of three standard deviations
oneither side of the centerline."

Does this mean, that my upper and lower contorl limits have always the
same distance from mean in a control chart?

If yes, is picture on p.196 not correct?

2 days before Exam and repeating the Glossary :-)
Chris

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