In this version of the fictitious problem involving test preparation and outcome, n=20 students are randomly divided into two groups, one of which receives a smart pill supplement and the other a placebo. The following code was used to obtain the following output.

proc reg ;

model y= supp z/ ss1 ss2;

run ;

The SAS System The REG Procedure Analysis of Variance Sum of Mean Source DF Squares Square F Value Pr > F Model 2 2039 . 50067 1019 . 75034 136 . 83 <. error . corrected total parameter standard variable df estimate t value pr> Itl Type I sS Type II SS Intercept 1 0 . 87294 2 . 28148 0. 38 0 . 7067 26938 1 . 09109 supp 0 . 84259 1 . 22368 0 . 69 0 . 5004 24 . 20000 3 . 53364 Z 1 . 13117 0 . 06879 16 . 44 <. .>