Walker, Helen Mary, 1891-  Walker, Helen Mary, 1891- <br/><br/>
Elementary statistical methods. 

 - Rev. ed. / [by] Helen M. Walker [and] Joseph Lev.  Rev. ed. / [by] Helen M. Walker [and] Joseph Lev. 
 - New York :  Holt, Rinehart & Winston,  [1958] 
<br/><br/> Includes list of formulas and answers to problems. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Statistics.