What is the difference between accuracy and precision? These terms are often used in measurements. Accuracy is the difference between the actual values and the desired target value. It is a measure of correctness. If the actual values are close to the target, it is said to be accurate (Figure 8-5).
Precision is the variation amongst the actual values. If the actual values are close together, they are said to be precise. In certain cases, the actual values can be far from the desired target value and still be precise (bunched together) but not accurate.