Nine samples of illicit heroin preparations were analyzed in duplicate by a gas chromatographic method. The samples can be assumed to have been drawn randomly from the same population. Pool the following data to establish an estimate of σ for the procedure.
Sample | Heroin, % |
1 | 2.24, 2.27 |
2 | 8.4, 8.7 |
3 | 7.6, 7.5 |
4 | 11.9, 12.6 |
5 | 4.3, 4.2 |
6 | 1.07, 1.02 |
7 | 14.4, 14.8 |
8 | 21.9, 21.1 |
9 | 8.8, 8.4 |
We need at least 10 more requests to produce the solution.
0 / 10 have requested this problem solution
The more requests, the faster the answer.