[R] Mean from confidence intervals

[csrabak]

Em 28/1/2011 20:15, Peter Francis escreveu:
> Dear List,
>
> I am not sure if A) this is possible or B) the correct place to ask.
>
> I am looking to find the mean - i have n, and the two-tailed confidence intervals 0.95&  0.25 with a  p-value of 0.05.
>
> Can i find the mean from this data ?
>
> Thanks
>
Peter,

Just a question others have not put forward, but that puzzles me: the 
confidence intervals are for the estimation of what?  Why you have the 
'n' (which I surmise it's being understood as "the number of samples") 
and a two tailed confidence intervals, and lastly what does the p value 
reports?