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To continue the analogy, if a large [[number]] of arrows are shot, precision would be the size of the arrow cluster. (When only one arrow is shot, precision is the size of the cluster one would expect if this were repeated many times under the same conditions.) When all arrows are grouped tightly [[together]], the cluster is considered precise since they all struck close to the same spot, even if not necessarily near the bullseye. The measurements are precise, though not necessarily accurate.
To continue the analogy, if a large [[number]] of arrows are shot, precision would be the size of the arrow cluster. (When only one arrow is shot, precision is the size of the cluster one would expect if this were repeated many times under the same conditions.) When all arrows are grouped tightly [[together]], the cluster is considered precise since they all struck close to the same spot, even if not necessarily near the bullseye. The measurements are precise, though not necessarily accurate.
However, it is not possible to reliably [[achieve]] accuracy in [[individual]] measurements without precision—if the arrows are not grouped close to one another, they cannot all be close to the bullseye. (Their [[average]] position might be an accurate estimation of the bullseye, but the [[individual]] arrows are inaccurate.) See also circular error probable for application of precision to the [[science]] of [http://en.wikipedia.org/wiki/Ballistics ballistics].[http://en.wikipedia.org/wiki/Accuracy_and_precision]
However, it is not possible to reliably [[achieve]] accuracy in [[individual]] measurements without precision—if the arrows are not grouped close to one another, they cannot all be close to the bullseye. (Their [[average]] position might be an accurate estimation of the bullseye, but the [[individual]] arrows are inaccurate.) See also circular error probable for application of precision to the [[science]] of [https://en.wikipedia.org/wiki/Ballistics ballistics].[https://en.wikipedia.org/wiki/Accuracy_and_precision]
[[Category: General Reference]]
[[Category: General Reference]]
