Thanks Vorlon for the lesson. ![Grin](https://talkelections.org/FORUM/Smileys/classic/grin.gif)
I did not get how you got 68% and 95% thing. I am going to re-read it and if I still don't understand I will probably ask you.
BTW - Cangratulations "Senator" shapeshifter... ![Roll Eyes](https://talkelections.org/FORUM/Smileys/classic/rolleyes.gif)
68% is 1 standard deviation in a bi-nomial expansion
95% is 2 standard deviations in a binomial expansion
There is nothng "magical" about 68% and 95% - just two places where the math is easy ![Cheesy](https://talkelections.org/FORUM/Smileys/classic/cheesy.gif)
assumes the questions is evenly divided (ie the "true" result is 50/50) as a practical matter untill you get to huge splits (say 70/30) the difference between the Binomial expansion error and the true error are minimal.
O now I understand.
![Smiley](https://talkelections.org/FORUM/Smileys/classic/smiley.gif)
I was wondering, where the hell you got those number.
![Smiley](https://talkelections.org/FORUM/Smileys/classic/smiley.gif)
Thanks again for the info and the congradulation.
![Smiley](https://talkelections.org/FORUM/Smileys/classic/smiley.gif)
Senator Shapesh**tter.