36 



Tables for Statisticians and Bio metricians 



TABLE XXV. 



Values of y = 



n — 2 to — 4 

 to — 3 ' n — 5 



l- 



4 2.,, ^ 



- . — it n be even , M 



3 v v I [« 



'„ . -x if n be odd 



(1 + z-) *.dz. 



Or, the probability that the mean of a sample of n, draiun at random from a 

 normal population, will not exceed (in algebraic sense) the mean of the popu- 

 lation by more than z times the standard deviation of the sample. 



