# Testing efficacy of two drugs. Eight patients were assigned into two groups
#   of four. Performance was measured before treatment (PreS) and after
#   treatment (AfterS). If one drug is more effective than the other, then 
#   AfterS should be greater given the same PreS 
Drug	PreS	AfterS
a	1	2
a	2	3.1
a	3	4.1
a	4	5
c	1	1
c	2	1.9
c	3	3.1
c	4	4