If the fit is to the function y = ax +b then there will be a confidence
interval for both coefficients (a and b)
See also
http://people.stfx.ca/bliengme/Excel...onfidence2.htm
best wishes

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Bernard V Liengme
Microsoft Excel MVP
http://people.stfx.ca/bliengme
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"Denis" wrote in message
...
When preforming a regression analysis, it gives us two cinfidence
interval.
The first one if for Beta1, what is the second for?