S2.2.3—Data quality Topic Practice
S2.2.3—Data quality Topic Practice
Improve data-quality judgement by spotting systematic and random error, explaining repeats, and deciding when quoted uncertainties are negligible.
How this is tested
- use graph evidence for systematic error, such as a best-fit line missing the origin beyond error bars
- explain that repeated readings reduce random uncertainty and improve precision, not guaranteed accuracy
- justify omitted uncertainty when a constant is known precisely or measurement uncertainty is negligible