误差 wùchā difference
difference; error; inaccuracy
How to remember 误差: 误 mistake + 差 differ from = difference.
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How it is used
- Margin of error / discrepancy between measured and true value - 允许的误差 (yǔnxǔ de wùchā) allowable error; 误差范围 (wùchā fànwéi) margin of error.
- Technical/statistical term. Note 差 reads chā here. It's inherent inaccuracy, not a blunder (错误 cuòwù).
- Common in measurement, science, engineering, polling.