Table 2 Uncertainty in analyzed concentration (repeatability) of gold metal
Sample no. | Weight of gold sample taken for analysis; W samp ,(g) | Weight of gold metal found after analysis; W Au (g) | Purity of gold determined in %; ( W Au/ W sam ) × 100 | Purity of gold with standard deviation (SD) | Standard uncertainty; Ustd = SD/√n |
|---|---|---|---|---|---|
Au-1 | 0.20071 | 0.20068 | 99.9900 | 99.993 ± 0.0027 | 0.0027/√5 = 1.23 × 10-3 |
Au-2 | 0.20151 | 0.20150 | 99.9950 | ||
Au-3 | 0.21207 | 0.21206 | 99.9953 | ||
Au-4 | 0.19983 | 0.19981 | 99.9900 | ||
Au-5 | 0.18876 | 0.18874 | 99.9947 |