I keep getting “Accuracy, precision and uncertainty” questions wrong in Experimental Skills. What's the trap?
calling tightly clustered but shifted readings accurate.
The usual trap: calling tightly clustered but shifted readings accurate. How to avoid it: tight cluster is precise; correct centre is accurate. Go back to the definition — Accuracy means closeness to the accepted value; precision means repeatability. Repeated measurements can reduce random uncertainty but cannot remove a systematic calibration error.
Key point
Accuracy, precision and uncertainty
Common mistake
calling tightly clustered but shifted readings accurate.
Memory tip
tight cluster is precise; correct centre is accurate.
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