Usually I would use software. As I tried to show is the sample syntax I posted
earlier, it doesn't usually make much difference whether you use z or t.
Gus Gassmann 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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