proc ttest data=tree;
class direction;
var diameter;
run;

proc ttest data=krabs sides=U;
class species;
var weight;
run;

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;

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

proc ttest data=fitness2;
var diff;
run;

data dailyshow;
input college$ watch$ count;
cards;
yes yes 363
yes no 736
no yes 242
no no 858
;
proc freq data=dailyshow order=data;
tables college*watch / chisq expected;
weight count;
run;