Date: Mon, 7 May 2007 15:54:09 -0400
Reply-To: Peter Flom <firstname.lastname@example.org>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: Peter Flom <peterflomconsulting@MINDSPRING.COM>
Subject: Re: Confidence Interval
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sanjay sun <sanjaysum@GMAIL.COM> wrote
>I have two treatment groups for which I need to derive 95% confidence
>Interval for a lab test. Could anyone tell me how I can do that?
A lab test of what?
Is the thing being 'tested' a categorical variable, a continuous one, or what?
If it is a continuous variable, may we assume it is normally distributed?
If not normal, HOW is it distributed?
Are there 'clumps'? Is there zero inflation?
Where did you get the data?