552 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1957 



700 



600 



500 



400 



300 



200 



100 



3 4 5 6 8 10 



k 



20 30 40 50 60 80 100 



Fig. 7 — Number of units n required per process to guarantee a probabilit}- of 

 P* = 0.50 of selecting the best of k binomial processes when the true difference 

 P[il ~ Pl2i is at least d*. 



700 



600 



500 



400 



300 



200 



100 



4 5 6 



10 



k 



20 



30 40 50 60 80 100 



Fig. 8 — Number of units n required per process to guarantee a probabilitj- of 

 P* = 0.60 of selecting the best of k binomial processes when the true difference 

 Pdl "~ Pl2i is at least d*. 



