1、INTERNATIONAL STANDARD IS0 10226 First edition 199 t-09-15 Aluminium ores - Experimental methods for checking the bias of sampling Minerais alumineux - Mr3fhodes expd,+.+- 0,028 SS, = cd; - + (ccl.)2 = 1,609 5 - (-;f7” = 1,593 3 ._ Sd = Jss,l(k - 1) = &yKqG- = 0,290 Thus )+JL 0,290 I,03 Table 1 give
2、s tr = 13, thus the number of data sets in the experiment is sufficient. 2 o=- - 0,028 %lA 0,290/- = - 0,432 t = 1,729 for lz = 20 from table 2 I&l t Table 5 - Numerical example 3 l I 12,64 12.99 -0,35 0,1225 2 II.47 11.60 -0,13 O,Oi69 3 12.35 12,27 0,08 0,0064 4 12.70 12,75 -0,05 0,0025 5 IO,64 10,
3、59 0,05 0,0025 6 Ii,78 II,63 0,15 0,0225 7 IO,55 IO,91 -0,36 0,1296 8 12.92 13.29 -0,37 0,1369 9 12.75 12,85 -0,lO 0,0100 10 12.09 12.36 -0.27 0,0729 11 13,73 13,38 0,35 0,1225 12 12,93 12,83 0,lO 0,0100 13 12,37 12,68 -0.31 0,0961 14 12,09 12.27 -0,18 0,0324 15 II,94 12,02 -0.08 0,0064 16 17 18 19
4、20 12.24 12,ll 10.36 11,80 12,14 _- Sum 11,54 0,70 0,490 0 11,62 0,49 0,240 1 10.46 -0,lO 0,0100 12,07 -0,27 0,0729 12,06 0,08 0,0064 -0,57 I,6095 Therefore, the difference, d= - 0,028 is not signifi- cant at the 5 % level and is negligibly small. Method l3 could then be adopted as a routine method.
5、 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 10226:1991(E) -.- -_ -.-. -_-_-_-.- _. -._-.-_ _- UDC 553.492:620.11:519.23 Descriptors: minerals and ores, alumlnlum ores, sampling, accuracy, statistical analysis. Price based on 5 pages - _-_- _-_._ Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
