Alan McLean <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
>
>
> Rich Ulrich wrote:
> >
> > On Mon, 5 Feb 2001 19:26:46 +0900, "rjkim" <[EMAIL PROTECTED]>
> > wrote:
> >
> > > hi, all.
> > >
> > > Isn't a chi-squre test inherently a 'one-sided sig. test'?
> >
> > The chi-square is to F as the normal z is to t.
> >
> > t^2 (xx degrees of freedom) equals F (1, xx degrees of freedom).
> > z^2 equals chi-squared.
> >
> > F is "two-tailed" and t can be "one-tailed."
> > Similarly, for the other two.
> >
>
> Whoops?! You can use F in a one tailed test! For example, if the
> alternative hypothesis is that sigma1^2/sigma2^2 > 1 (so the null is
> that the ratio is less than or equal to 1.
Since he was discussing it in relation to the t-test, clearly
Rich was talking about an F-test for testing differences in means.
Or do you claim that you use a t-test for variances?
Glen
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