Ferguson, George Andrew. <br/><br/>
Statistical analysis in psychology & education / 
George A. Ferguson. 
 - 4th ed. 
 - New York :  McGraw-Hill,  1976. 
 - x, 529 p. :  ill. ;  25 cm. 
<br/><br/> Includes index. 
<br/><br/>p. 480-483. 
<br/><br/><label>ISBN: </label>0070204802 
<br/><br/><label>LCCN: </label>75-015840 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Statistics.<br/>Psychometrics.<br/>Educational statistics.