data TestScores; input TScore_before TScore_after @@; datalines; 123 133 135 136 129 135 117 137 120 142 138 135 140 121 145 147 136 168 140 152 146 129 137 145 ; run;
proc print data=TestScores;
run;
ods graphics on;
proc ttest;
paired TScore_before*TScore_after;
run;
ods graphics off;