Re: st: When is the t-test appropriate?

[Ricardo Ovaldia <ovaldia@yahoo.com>]

--- Jon Wainwright <jwainwright@austin.rr.com>
wrote:
> I would like to compare the means of two very
small
> random samples (n1=3,
> n2=7). Both samples were drawn from populations
of
> unknown distribution. 

With that size (3 & 7)I would not use an
asymptotic test. Use a non-parametric Mann-Whitney U
(wilcoxon)test. See the -ranksum- command in Stata.

Ricardo.

=====
Ricardo
Statistician 
Center for Applied Research
University Hospital
Oklahoma City,OK

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