Walker, Helen M.    1891-1983 <br/><br/>
Elementary statistical methods /  
Helen M. Walker. 
 - New York :    Henry Holt and Co.,    1943. 
 - xxv, 368 p. :    ill., diagrs. ;    25 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Statistics.
<br/><br/><label>Dewey Class. No.: </label>311.2