Luis A. Afonso wrote: > 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).
I'll leave it to others to decide whether 0.9717 and 0.9786 are more than slightly different,
______Relative errors (absolute values): ______ > Not using C.C.___ (282-156)/156 = 35.9% _________ using C.C.___ > (144-156)/156 = 7.7 % Therefore ______this last one procedure > improves almost FIVE TIMES the result. To use it is an indisputable > MUST. ********************** > But i find this curious: are you really saying that one must use the Normal approximation with a continuity correction, rather than the exact binomial calculation? If so, why? And why can't this be disputed?
-- Bob O'Hara
Dept. of Mathematics and Statistics P.O. Box 68 (Gustaf Hällströmin katu 2b) FIN-00014 University of Helsinki Finland