Snedecor, George W.   1909-1980. <br/><br/>
Statistical methods / 
George W. Snedecor, William G. Cochran. 
 - 7th ed. 
 - Ames, Iowa :  Iowa State University Press ,  1980. 
 - xvi, 507p. :  ill. ;  24cm. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>ISBN: </label>0813815606 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Statistics --methods.