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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