a  Abdullahi, Umar Kabir <br/><br/>
\a Study on Ratio-Product Estimator of Population Mean using some known Parameters of the Auxiliary Variable   \h [Text] 
\c by Umar Kabir Abdullahi  
 - \a  Zaria:  \b  Dept. of Statistics, ABU.  \c  2017 
 - \a ix, 63leaves.:  \b ill. 
<br/><br/>\a  Faculty of Physical Sciences 
<br/><br/>\a Includes bibliographical references 
<br/><br/><label>LC Class. No.: </label>\a QA 276.18Abd  / \b 500223