minitab can do this in several ways ...
i randomly put some data into 3 columns ... did a simple ANOVA ... and,
under the older style graphics ... got ...
MTB > rand 20 c1;
SUBC> inte 10 20.
MTB > rand 20 c2;
SUBC> inte 15 30.
MTB > rand 20 c3;
SUBC> inte 25 35.
MTB > aovo c1-c3
One-way ANOVA: C1, C2, C3
Analysis of Variance
Source DF SS MS F P
Factor 2 2460.6 1230.3 98.34 0.000
Error 57 713.1 12.5
Total 59 3173.7
Individual 95% CIs For Mean
Based on Pooled StDev
Level N Mean StDev ---------+---------+---------+-------
C1 20 14.550 3.086 (-*--)
C2 20 21.450 4.347 (--*-)
C3 20 30.200 3.019 (-*--)
---------+---------+---------+-------
Pooled StDev = 3.537 18.0 24.0 30.0
MTB >
the CIs are based on a pooled sd ...
there is a better graph version of this and ... you CAN regulate the amount
of confidence ... the default is 95
At 10:56 AM 7/1/02 -0400, David Treder wrote:
> > On 29 Jun 2002 07:23:56 -0700
> > [EMAIL PROTECTED] (SR Millis) wrote:
> >
> > > I'm graphically-challenged and need help on the simple graphing/plotting
> > > of confidence intervals.
>
>
>If you want to use SAS, their Website has some examples of what
>you are looking for:
>
>http://www.sas.com/service/techsup/sample/sample_graph.html
>.
>.
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Dennis Roberts, 208 Cedar Bldg., University Park PA 16802
<Emailto: [EMAIL PROTECTED]>
WWW: http://roberts.ed.psu.edu/users/droberts/drober~1.htm
AC 8148632401
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