Page 17 - Pharmaceutical Analytical Chemistry III

3. Gross Errors

Usually obvious - give “outlier” readings ,
results that appear to differ markedly from all
other data in a set of replicate measurements.
They usually occur only occasionally, are often
large, and may cause a result to be either high
or low.
They are often the product of human errors.

For example, if part of a precipitate is lost

before weighing, analytical results will be low.