Precision vs. Accuracy
Precision :-
Precision is the repeatability of a measuring process or simply, how well identically performed measurements agree with each other. This concept applies to a process or set of measurements, not a single measurement.
Accuracy:-
Accuracy is the agreement of the result of a measurement with the true value of the measured quality. It would be clear from the example given below,
Eg. If a carpenter had to cut a board to fit the shelf into two projections in the wall, it does not matter whether his scale is accurate or not, provided he uses the same scale for the measurement of board and the distance between projections in the wall. Here the precision with which he measures two is of importance. Now supposing he had to order for the board from market then it is necessary that the scale used by him and the one in market are in agreement with each other. One way to achieve this is that both use the accurate scales in accordance with the standard scales. In this case accuracy of the scale is important and it should be manufactured such that it’s units are in accordance with the standard units set.
 |
| Image from http://cdn.antarcticglaciers.org/wp-content/uploads/2013/11/precision_accuracy.png |
COMMENTS