After working the problems yourself, you can check your answers!
Drivers 
Conductors 

Total calories 
2821 ± 44 
2844 ± 48 
Alcohol (g) 
0.24 ± 0.06 
0.39 ± 0.11 
(a) What does "s. e." stand for? Give the mean and standard deviation for each of the four sets of measurements.
(b) Is there significant evidence at the 5% level that conductors consume more calories per day than do drivers?
(c) How significant is the difference in alcohol consumption between the two groups? Give either a P value or some equivalent statistic.
Blood Type  Hawaiian  Hawaiianwhite  HawaiianChinese  White 
O 
1903  4469  2206  53,759 
A  2490  4671  2368  50,008 
B  178  606  568  16,252 
AB  99  236  243  5001 