Re: One tailed vs. Two tailed test

[Vit Drga]

On Fri, 16 Mar 2001 23:40:07 -0000, [EMAIL PROTECTED] (Jerry
Dallal) wrote:

>FWIW, for large samples, 0.1% in the unexpected tail 
>corresponds to a t statistic of 3.09.  I'd love to 
>be a fly on the wall while someone is explaining to 
>a client why that t = 3.00 is non-significant!  :-)

What if you had an effect that when it does happen is pretty obvious
(e.g. H_1 results in a std t-distn mean-shifted to mean = 10)? An
observed t-value of 3 may be statistically significant  at the 0.1%
level and yet should still count as evidence for the null hypothesis
rather than against it.  But, of course, in situations like that there
is no need to run a statistical test...

Vit D.



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