Question

Consider the following statements regarding precision in measurements of a quantity:

1. Precision is the measure of the spread of the incident errors.

2. Precision is independent of the realizable correctness of the measurement.

3. Precision is usually described in terms of number of digits used in the measurement by a digital instrument.

Which of the above statements are correct?
1. 1, 2 and 3
2. 1 and 2 only
3. 1 and 3 only
4. 2 and 3 only

Answer 1

Correct Answer - Option 1 : 1, 2 and 3

Precision: The most repeatable value (or) the reproducible value out of the set of records is known as precision. It is the measure of consistency. It gives the closeness of individual measured value to the average of all measured values.

The precision of an instrument does not guarantee accuracy. The precision can be achieved without accuracy. So, it is independent of the realizable correctness of the measurement

An instrument with more significant figures has more precision and hence precision is usually described in terms of number of digits used in the measurement by a digital instrument.