
Re: Help with probability&stat problem
Posted:
Jun 13, 2007 9:39 AM


> Added Note > > 1) The discussion was about if C.C. worsen the > results comparing with the raw calculation. IT DID > NOT. > 2) The two normal approximations have rather > different accuracies (they ARE NOT slightly different > contrarily Bob said). > ______Relative errors (absolute values): > ______ Not using C.C.___ (282156)/156 = 35.9% > _________ using C.C.___ (144156)/156 = 7.7 % > Therefore > ______this last one procedure improves almost FIVE > TIMES the result. To use it is an indisputable MUST. > ********************** > > Licas
The exact probablity calculated from the binomial distribution is 0.0015595.
The Afonso normal approximation is 0.002115.
The "improved" Afonso normal approximation with a correction factor is 0.003061, which is worse.
Jack

