## 字幕列表 影片播放

• A good scientific measurement is made with accuracy and precision.

一個好的科學量測方式須具備準確度和精密度

• Accuracy tells us how close

準確度是指

• a particular measurement is to the correct value.

測量出的數據有多接近正確的數值

• For instance,

舉例來說

• how close is the reading of a thermometer to the actual temperature?

溫度計顯示出的溫度和真實的氣溫有多少誤差?

• Precision is the consistency of repeated measurement.

精密度則是指多次測量結果的一致性

• In other words, are the results consistent

也就是說，每次測量時

• each time something is measured?

結果是否都相同?

• The more consistent the results,

得到的結果越一致

• the more precise the measurement.

表示精密度越高

• It is possible to have a precise measurement that is not accurate.

有可能出現高精密度而低準確度的情況

• It is also possible to have an accurate measurement that is not precise.

也可能會是高準確度卻低精密度的結果

• The best measurements are both accurate and precise!

所以最好的測量方式還是兩者兼具

• Let us look more closely at the difference between accuracy and

讓我們進一步解釋準確度和精密度的不同

• precision using an archer and target.

舉一個弓箭手和箭靶的例子

• The archer is accurate when he hits the bull's eye.

當弓箭手正中紅心，代表他的射擊很準確

• He is precise when he can consistently hit the same spot on the target,

當他持續射中靶上的同一區域，表示他很精確

• in this case the bull's eye, over and over again.

在這個例子中，他一次又一次擊中

• This archer is both accurate (he hits the bull's eye) and

表示這個弓箭手兼具準確度 (他正中紅心) 和

• precise (he is able to hit the same area of the bull's eye repeatedly).

精密度 (他能不斷擊中同一區域)

• It is also possible for the archer to be precise, but inaccurate.

也有可能這個弓箭手射擊精密，但不準確

• If he misses the bull's eye, he is inaccurate; he has missed the mark.

如果他沒正中紅心，表示他射得不準確，偏離目標

• But if he can consistently and

但如果他可以持續且

• repeatedly hit the target in the same place,

重複的擊中同樣的地方

• even if it is not the bull's eye, he is precise.

即使不是在標靶中心， 他仍是精確的

• On the other hand, the archer may be accurate, but not precise.

反過來說，弓箭手也有可能射擊準確，卻不精密

• If he strikes the bull's eye or right next to the bull's eye,

如果他射中紅心，或只偏離紅心一些的區域

• but his arrows are not consistently placed,

但他的箭卻較分散

• then the archer is accurate, but not precise.

那表示這個弓箭手是具有準確度，卻沒有精密度

• In this case,

在這個例子裡

• the arrows would be spread across the bull's eye

箭會散落在紅心附近的區域

• rather than clumped together in a small area.

而不是擠在一個極小的範圍裡

• If our archer is having a really bad day,

又如果我們的弓箭手今天運氣不太好

• he might even be inaccurate and imprecise.

它甚至有可能不準確又不精密

• In this case,

範例中

• his arrows will strike the target in a random pattern and

他的箭會隨機的擊中標靶，而且

• he will not hit the same part of the target time after time.

每一次都無法射中標靶的同一位置

A good scientific measurement is made with accuracy and precision.

B1 中級 中文 美國腔 弓箭手 準確 標靶 擊中 射中 射擊

# 精度和精度 (Accuracy and Precision)

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羅紹桀 發佈於 2021 年 01 月 14 日