options nodate pagesize=54 linesize=80;

/* Read in the input file   */

data ex0403;
* infile '../../../data/biostat/ex0403.dat';
infile 'C:\biostat\data\ex0403.dat';
input subject highfat lowfat;
high_low = highfat-lowfat;
run;

/* Obtain 95% confidence interval where high_low is the difference in clearance
under the 2 diets (highfat-lowfat) */

proc means mean std stderr clm;
var high_low;
run;


quit;