I keep getting “Errors in measurement” questions wrong in Units, Dimensions & Measurement. What's the trap?
mixing up accuracy (closeness to the true value) with precision (repeatability).
The usual trap: mixing up accuracy (closeness to the true value) with precision (repeatability). How to avoid it: in products/quotients, percentage errors simply add up. Go back to the definition — absolute error = |measured − true|, relative error = absolute/true, percentage error = relative × 100.
Key point
Errors in measurement
Common mistake
mixing up accuracy (closeness to the true value) with precision (repeatability).
Memory tip
in products/quotients, percentage errors simply add up.
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