# Accuracy, Precision, and Percent Error

## Key Questions

Maybe by ${\sigma}_{d}$, $\text{the standard deviation...}$
As you should know, $\text{accuracy}$ refers to the closeness of a measurement to the TRUE value; whereas $\text{precision}$ refers to the repeatability of a measurement. Precise measurements may be inaccurate due to some systematic error, and accurate measurements may be imprecise given the scatter, i.e. the range of a series of measurements.
You will introduced to a range of ways of dealing with error in your analytical chemistry text. This will also include formal definitions of ${\sigma}_{d}$...