003220000a22001330004500060000800000082002100008100001900029245003000048250000600078260004200084260000900126300000800135650004500143  a100  a519.502 4574 CAM  aCampbell,  R C  aStatistics for biologists  a2  aCambridge, Cambridge University Press  c1974  a381  aStatistics/ Normal distribution/ Surveys