Anon.
Posts:
219
Registered:
12/13/04


Re: Help with probability&stat problem
Posted:
Jun 13, 2007 7:58 AM


Luis A. Afonso wrote: > EXACT : p(X<=10) = 0.00156 > > Normal Approximation > > *** Without C.C. > Z = (10  22)/sqrt(0.2*0.8*110) = 22/ 4.1952?= 2.8604. _________________ F(Z) = 0.00212 > *** With C.C. > ________Z = (10  22 + 0.5)/ 4.1952? = 2.9796 > ________________________ F(Z) = 0.00144 > > > The differences approxEXACT are respectively > > _______Without = +0.00056 > _______With C.C. = 0.00012 > > > .. and all Jack Tomsky´s argumentation falls on earth. > ********************************************* > What seems very silly about this latest spat is that Jack showed the exact test, and made the comparison to the approximation that the OP had used. Luis has used a different approximation, and come to a slightly different answer.
But you both appear to agree on the exact calculation.
Bob
 Bob O'Hara
Dept. of Mathematics and Statistics P.O. Box 68 (Gustaf Hällströmin katu 2b) FIN00014 University of Helsinki Finland
Telephone: +3589191 51479 Mobile: +358 50 599 0540 Fax: +3589191 51400 WWW: http://www.RNI.Helsinki.FI/~boh/ Journal of Negative Results  EEB: http://www.jnreeb.org

