Re: Am I using the z-table incorrectly?
- From: "Luis A. Afonso" <licas_@xxxxxxxxxxx>
- Date: Sat, 30 Jun 2007 14:34:50 EDT
WRONG
Since X is a discrete r.v. (the number of absences per year is a whole number X = 0, 1, ...) we should use the
continuity correction , so that
_____Z= (8.5-7)/(3/sqrt(60)) = 3.8730
_____then p(Z>3.8730) = 0.00005375
*****
Licas
NOTE that because the mean (=7) is different to the variance (=3^2= 9) the use of the Poisson Distribution is forbidden.
.
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