Only as an approximation.
At 12:57 PM 12/10/01 -0400, you wrote:
>Art Kendall wrote:
>
>(putting below the previous quotes for readability)
>
> > Gus Gassmann wrote:
> >
> > > Dennis Roberts wrote:
> > >
> > > > this is pure speculation ... i have yet to hear of any convincing case
> > > > where the variance is known but, the mean is not
> > >
> > > What about that other application used so prominently in texts of
> > > business statistics, testing for a proportion?
>
> > the sample mean of the dichotomous (one_zero, dummy) variable is known, It
> > is the proportion.
>
>Sure. But when you test Ho: p = p0, you know (or pretend to know) the
>population variance. So if the CLT applies, you should use a z-table, no?
>
>
>
>
>
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