* the data is the results to test the effect of a physical fitness course
on one's physical ability. The number of sit-ups that a person could do in 
1 minute, both before and after the fitness course. Can you conclude that 
a significant amount of improvement took place? ;

data fitness;
input before after;
cards;
29 30
22 26
25 25
29 35
26 33
24 36
31 32
46 54
34 50
28 43
;
run;

proc print data=fitness;
run;

proc ttest data=fitness;
paired after*before;
run;

* OR;

data fitness2;
set fitness;
diff=after-before;
run;

proc print data=fitness2;
run;

proc ttest data=fitness2;
var diff;
run;