Ans: Differentiate between precision and accuracy.
| Precision | Accuracy |
| (i) Precision refers to the degree of consistency or reproducibility of measurements. | (i) Accuracy refers to the degree of closeness between a measured value and the true or accepted value. |
| (ii) A measurement is precise if repeated measurements under the same conditions yield similar results, regardless of how close those results are to the true value. | (ii) A measurement is accurate if it is close to the true value, regardless of how consistent or reproducible it is. |
| (iii) Precision is often quantified by the spread or variability of measurements around the mean value. A higher precision indicates less variability among measurements. | (iii) Accuracy is often quantified by the difference between the measured value and the true value. A measurement with a smaller difference is considered accurate. |
| (iv) For example, if a set of measurements of the length of an object consistently yields values close to each other, even if they are far from the true value, those measurements vary widely. are considered precise. | (iv) For example, if a measurement of the length of an object is very close to the actual length, it is considered accurate, even if repeated measurements vary widely. |