Guilford, J.P. <br/><br/>
Fundamental statistics in psychology and education/3e 

 - 3rd ed. 
 - New York  McGraw Hill  1956 
 - xi, 565p 
<br/><br/><label>Subjects--Index Terms: </label>Arithmetic mean 
<br/><br/><label>Dewey Class. No.: </label>519.5  / GUI