00310nam a2200121 a 450000500170000008200200001710000160003724500240005325000170007726000410009430000290013563000240016420251202164218.0  a519.502433bGUP  aGupta, S.P.  aStatistical methods  a2nd rev. ed.  aNew DelhibSultan Chand & Sonsc1996  axxii, 2000 p.b24cm.cPB  aStatistical Methods