Programa experimental
International Baccalaureate · IB Diploma · Sports, Exercise and Health Science · HL Tópico 12 1:04 Narração em inglês · Legendas em inglês + 中文 gravadas
Capítulos
Transcrição
These are selected topics, not the whole syllabus, and every example is fictional.
这些是精选主题，不是完整大纲，所有例子都是虚构的。
Every reading carries an uncertainty; random scatter averages out, systematic error does not.
每个读数都有不确定度；随机波动可以平均掉，系统误差不能。
Each point carries an error bar, and a line of best fit passes within every bar, so the model fits within the measurement range.
每个点都有误差棒，最佳拟合线穿过每一个误差棒，所以模型在测量范围内成立。
For one reading, 50.0 millimetres with an uncertainty of 1.0 millimetre is 2 percent.
单个读数 50.0 毫米、不确定度 1.0 毫米，即 2%。
For a quotient, add the percentage uncertainties: 2 plus 3 is 5 percent.
商的不确定度把百分比相加：2 + 3 = 5%。
Repeating readings and averaging reduces random scatter in the mean.
重复读数取平均能减小平均值的随机波动。
But a calibration offset shifts every reading the same way, so the repeats cluster around the same wrong value.
但校准偏移会使每个读数朝同一方向偏移，所以重复读数都聚集在同一个错误值附近。
Only recalibrating removes it.
只有重新校准才能消除它。
And do not quote more decimal places than the measurement supports.
不要给出超过测量精度的小数位数。
Check yourself.
自我检测。
1 centimetre on 40 is 2.5 percent.
40 厘米 ± 1 厘米，2.5%。
4 on 80 is 5 percent.
80 中的 4，5%。