Since chemistry for the most part deals with quantitative measurement, precision and accuracy are used often to measure the numerical results. Most people use the words "accuracy" and "precision" interchangeably and think that they are the same. Well, they are different.
In plain English, precision is how well you can repeat the measurement values, and accuracy is how close you can get to the right answer. That is, accurate data are always precise, but precise data may not always be accurate.
Precision is the closeness of two sets of measured groups of values. Just think of this as the degree of reproducibility of a set of measurements. This does not necessarily reflect the closeness to the true value.
Accuracy is linked to how close a single measurement is to the true value. High accuracy means getting close to the truth.
Until next time, student, keep it up!
Committed to Your Success
Wayne Huang, PhD
"The Rapid Learning Coach"
ChemTips@RapidLearningCenter.com
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