Which of the following statement is correct?

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There is no difference between precision and accuracy.

A good precision always means good accuracy

Accuracy means that all measured values of an experiment are close to the actual value.

A measurement may have good accuracy but poor precision.

answer is D.

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Detailed Solution

Precision refers to closeness of various measurements for the same quantityAccuracy means that the average of all the measured value is equal to the actual value1) Precision and accuracy have difference (false)2) A good precision always means good accuracy (false) Example - Let actual result is 9 and the measured values are 8.93,8.94,8.95 The value are close to each other precision is good average of 8.93,8.94,8.95 is 8.94. 9 is the actual result the average of measured value is 8.94 the measurements are not accurates3) Accuracy means that all measured values of an experiment are close to each other (false) The above definition holds good for precision4) A good accuracy may have poor precision (True) Example Actual result is 9.1 The measured values are 8.9,9.1and 9.3 Precision is poor but it have good accuracy because average of 8.9 , 9.1 and 9.3 is 9.1

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