Well I seemed to have answered my own question with a little research and some quick proof (sloppy).
But basically if u are give n points then you will have a degree of accuracy of
I basically took a comparison of points version there accuracy and realized that the pattern was two times the number of points minus one....
See Link for more detail....
http://s3.amazonaws.com/cramster-res...77_n_22315.pdf
If this is wrong please let me know thanks!