na INLIS000000000001064 20231121084058 0010-1123000046 ta 231121 g 0 eng 0-8138-1560-6 519.5 519.5 GEO s George W. Snedecor Snedecor and Cochran : Statistical Methods Seventh Edition United States of Amerika : The Iowa State University Press, 1980 xv, 507p. : ill.; 23 cm William G. Cochran Statistical Methods