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Which is more important: accuracy or precision?

Both accuracy and precision are equally important in order to have the highest quality measurement attainable. For a set of measurements to be precise, there is no requirement that they are accurate at all. This happens because as long as a series of measurements are grouped together in value, then they are precise. However, there is no rule that the value they are grouped around needs to be close to the true value of the item being measured. Because of this, sometimes accuracy is valued over precision, simply because it can be more useful in determining the needed value. However, when maintaining a measurement system, the system must be checked regularly for both accuracy and precision, since they are both equally important for measurement success.

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