Maybe checking a statistics book to find the methodology is step 1. Then we
can help you execute this in Excel
best wishes
--
Bernard V Liengme
Microsoft Excel MVP
http://people.stfx.ca/bliengme
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"new user" wrote in message
...
i have a data and i want know the hohmogeneity for it ; 95 % of the normal
distribution near the optimum point of its chart