Snedecor, George Waddel,  1881- <br/><br/>
Statistical methods / 
George W. Snedecor, William G. Cochran. 
 - 7th ed. 
 - Ames, Iowa   Iowa State University Press   1987. 
 - xvi, 507 p.   ill.   24 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0813815606 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Estadística.
<br/><br/><label>LC Class. No.: </label>HA29  / .S63 1978