Table T3. Major element precision figures for five XRF runs of Sample 171B-1049C-8X-5, 88-90 cm.
| Element (wt%) |
Mean (N = 5) |
Standard deviation* |
Standard error |
95% confidence |
99% confidence |
|---|---|---|---|---|---|
Si |
17.031 |
0.157 |
0.070 |
0.195 |
0.323 |
Al |
5.575 |
0.071 |
0.032 |
0.088 |
0.146 |
Fe |
5.420 |
0.071 |
0.032 |
0.089 |
0.147 |
Mg |
2.055 |
0.018 |
7.955 
10-3 |
0.022 |
0.037 |
Ca |
12.141 |
0.127 |
0.057 |
0.158 |
0.262 |
Na |
1.782 |
0.567 |
0.254 |
0.705 |
1.168 |
K |
0.897 |
0.010 |
4.547
10-3 |
0.013 |
0.021 |
Mn |
0.015 |
7.276
10-12 |
3.254
10-12 |
9.034
10-12 |
1.498
10-11 |
Ti |
0.278 |
5.362
10-3 |
2.398
10-3 |
6.658
10-3 |
0.011 |
P |
0.017 |
0.000 |
0.000 |
0.000 |
0.000 |
Note: * = in standard deviation units; all other units are the same as elemental abundance.