00313nam a2200121 a 450000500170000008200150001710000190003224500510005125000160010226000290011830000210014770000230016820251203090731.0  a519.5bDAV  aDavies, Owen L  aStatistical methods in research and production  a4th ed.rev.  aNew DelhibLongmanc1986  a478p.c22cm.bPB  aGoldsmith, Peter L