[R] confidence interval given by prop.test()

[Uwe Ligges]

mai at ms.uky.edu wrote:
> 
> Dear R-help,
> 
> > prop.test(9, 137, p=0.066)
> 
> > prop.test(9, 137, p=0.05)
> 
> give two different 95% confidence intervals.
> I thought the confidence interval calculation
> should be independent of testing calculations (and thus
> the null hypothesis)?


You can transform a two sided test problem into a confidence interval
and vice versa.
Why should the confidence intervals be the same for different
probabilities of success in this case?
 
> Splus 2000 has similar problems but give slightly different
> answer.

Uwe Ligges
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