00381nam a2200145Ia 4500008004100000082001400041100002100055245003500076260005000111300000800161650002000169650001500189653001500204700001600219170901s1965    xx            000 0 und d  a311bW13E  aWalker, Helen M. 0aElementary Statistical Methods  aCalcuttabOxford and IBH Publishing Co.c1965  a302  aSocial sciences  aStatistics  aStatistics  aLev, Joseph