study	meanT	sdT	nT 	meanC	sdC	nC 
A	94	22	60	92	20	60
B	98	21	65	92	22	65
C 	98	28	40	88	26	40
D 	94	19	200	82	17	200
E	98	21	50	88	22	45
F	96	21	85	92	22	85