Re: [benchmarksixsigma] Control Chart

Hi,

Hope this helpful to you. If need any clarification pls feel free to ask.

Of all the tools for analyzing data, the control chart is the most useful. Noother tool captures the voice of your process better. Control charts are usedto determine whether your process is operating in statistical control. Until itis, any improvement efforts are, at best, mere process tampering. Basically,a control chart is a run chart (described earlier) that includes statisticallygenerated upper and lower control limits.The purpose of a control chart is to detect any unwanted changes in yourprocess. These changes will be signalled by abnormal points on the graph.Extensive research by Dr. Shewhart indicated that by establishing upperand lower limits at three times the standard deviation of the process (plusand minus, respectively), 99.73% of the common cause variation would fallwithin these limits.A process is said , therefore, to be in “statistical control” when the processmeasurements vary randomly within the control limits; that is, the
variationpresent in the process is consistent and predictable over time.
Best Regards,
Zahir Hussain
Qatar
00974 5824983

--- On Tue, 8/11/09, shailee shrivastava <imhappy2k5@yahoo.com> wrote:

> From: shailee shrivastava <imhappy2k5@yahoo.com>
> Subject: [benchmarksixsigma] Hi
> To: benchmarksixsigma@yahoogroups.com
> Date: Tuesday, August 11, 2009, 10:59 AM
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> Can any one tell me in simple words that what is
> control chart.
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> Regards
> Ria
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