* test H0: mu=5 Ha: mu not= 5;
proc ttest data=flower h0=5;
var s_length;
run;

* test H0: mu=5 Ha: mu > 5 with alpha=10%;
proc ttest h0=5 data=flower alpha=.1 sides=U;
var s_length;
run;

* test H0: mu=5 Ha: mu < 5 with alpha=1%;
proc ttest h0=5 data=flower alpha=.01 sides=L;
var s_length;
run;