No. | Strata/Firm | Economic Sector | Total Number | Sample size (30%) | Number | Sample size used (50%) | Number used |
01 | ETS OLIVE-Minings | Wolframite-Cassiterire | 21 | 6.3 | 6 | 10.5 | 11 |
02 | ETS OLIVE Agriculture | Cinchona tree | 26 | 7.8 | 8 | 13 | 13 |
03 | CONGOCOM S.A.R.L | Wolframite-Cassiterite and Gold | 33 | 9.9 | 10 | 16.5 | 17 |
04 | NBB & Frères S.A.R.L | Colombo-Tantalite, Cassiterite, and Gold | 26 | 7.8 | 8 | 13 | 13 |
TOTAL |
| 106 | 31.8 = ±32 | 32 | 53 | 54 |