* Example for one sample testing problem;
options pagesize=53 linesize=76 pageno=1 nodate;
data keybrd;
 input time;
 centered=time-47.20;
 label time="Completion Time"
       centered="Completion Time - 47.20";
 datalines;
  42.86
  37.56
  31.47
  46.46
  36.36
  58.05
  35.49
  43.31
  36.19
  42.79
  41.64
  38.77
  54.99
  37.63
  55.70
  43.78
  41.68
  37.90
  50.70
  47.74
  48.94
  59.93
  41.63
  38.12
 run;
proc sort;
by time;
* increasing order;
* by descending time;
* for decreasing order;
title "Testing for Population Mean ";
title2 "Completion Time of 47.20";
* page heading literal;
proc print label; 
* column headings are labels;
* variable names otherwise;
var centered time;
* optional statement;
* default: all variables in order created;
proc means n nmiss mean std stderr median min max maxdec=3;
* n: number of observations;
* nmiss: number missing obs.;
* mean: average of obs.;
* std: standard deviation;
* stderr: standard error = std/(n)1/2 ;
* t: t for testing if population mean is zero = mean/stderr;
* can only test for zero, testing centered for zero,same as testing time for 47.20;
* prt: p-value for t test;
* maxdec=3: round to 3 digits;
var time;
* optional statement;
* default: all numeric variables in order created;
proc univariate normal;
* normal: test for normality;
* plot: request three plots:stem and leaf plot,
box (and whiskers) plot,
normal (probability) plot;
var centered;
* same as for proc means;
histogram/normal cfill=white pfill=solid midpoints=-15 to 15 by 3;
probplot/normal(mu=est sigma=est w=1 l=1);
run;