00280nam a2200109 a 450000500170000002000150001708200190003210000170005124500420006826000420011030000180015220251203110118.0  a8170002311  a020.15195bSEH  aSehgal, R.L.  aStatistical techniques for librarians  aNew DelhibEss Ess Publicationsc1998  a410p.c23 cm.