1. A laboratory wants to estimate the within-lab reproducibility component (component accounting for the random effects) of measurement uncertainty of protein content determination in different foods. For this protein content in a control sample of smoked sausage was determined repeatedly during a time period of almost one year. Every day when this smoked sausage was analysed only one parallel measurement was made. The following results were obtained:
Week | Result (g/100g) |
3 | 18.1 |
5 | 20.5 |
11 | 18.3 |
14 | 19.1 |
15 | 19.3 |
27 | 20.2 |
34 | 19.7 |
41 | 19.5 |
42 | 18.6 |
48 | 20.1 |
Please calculate the within-lab reproducibility component of uncertainty (please give 2 or 3 decimals). Absolute uncertainties can be used in this case.
The reproducibility component is found as the standard deviation of the results obtained on different days.