558 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1957 



Again we can rewrite the specification that the experimenter wants 

 to satisfy in the simple form 



(13) 



Pea ^ P* for pii] ^ p*] and p^] S pfaj 



Tables VI and VII give the number of observations required per proc- 

 ess for several selected triplets of specified constants (p*] , pfi] , P*) 

 wtien k = 2 and ^- = 4. These results are also given in graphical form 

 in Figs. 15 and 16. 



180 

 170 

 160 

 150 

 140 

 130 

 120 

 1 10 



100 



I 

 90 



80 



70 



60 



50 



40 



30 



20 



10 



0.5 



0.6 



0.7 



o.a 



0.9 



1.0 



Fig. 15 — Number of units required per process to guarantee a probability of 

 P* of selecting the better of two binomial processes when the true p [ij ^ p*i] and 

 the true pn] ^ pi^] • 



