1. What types of performance characteristics are described? Please choose correct characteristic.
Description 
Characteristic 
Mean value of 6 measurement results of the same sample was 5.2 mg/L, reference value was 5.0 mg/L. 

Standard deviation of the mean of 6 titration results of the same sample was 0.02 mL. 

Repeatability of the method obtained as the pooled standard deviation from 127 measurement results. 

Measurement uncertainty was estimated as ±0.2 mg/L, k = 2. 

Relative expanded uncertainty of the method is in the range of 0.9 – 1.1%, k = 2, depending on measurement conditions. 

Analyte loss occurs during sample pretreatment, causing systematically lower results. Lowering of the results has been estimated to be on an average 5%. 
