Q23 / 79 · NEST (NISER) 2026 · Chemistry
Two students (P and Q) independently made three measurements (denoted by I, II, and III) of the same property. The expected correct value is $9.0$. The observed values by the students are provided in the given table.
Student I II III Average P $8.9$ $9.1$ $9.0$ $9.0$ Q $8.0$ $9.0$ $10.0$ $9.0$
Based on the given data, the correct statement is:
| Student | I | II | III | Average |
|---|---|---|---|---|
| P | $8.9$ | $9.1$ | $9.0$ | $9.0$ |
| Q | $8.0$ | $9.0$ | $10.0$ | $9.0$ |
Based on the given data, the correct statement is:
- AP is more accurate but less precise than Q.
- Correct answerBBoth P and Q are equally accurate but P is more precise than Q.
- CBoth P and Q are equally precise but P is more accurate than Q.
- DP is less accurate but more precise than Q.
Solution
Accuracy is a measure of how close the average of the measured values is to the true value. The expected correct value is $9.0$. The average value for both students P and Q is $9.0$. Thus, both P and Q are equally accurate.
Precision is a measure of how close the individual measurements are to each other. The measurements of student P ($8.9$, $9.1$, $9.0$) are much closer to each other compared to the measurements of student Q ($8.0$, $9.0$, $10.0$). Thus, P is more precise than Q.
Therefore, both P and Q are equally accurate but P is more precise than Q.
Answer: Both P and Q are equally accurate but P is more precise than Q.
Precision is a measure of how close the individual measurements are to each other. The measurements of student P ($8.9$, $9.1$, $9.0$) are much closer to each other compared to the measurements of student Q ($8.0$, $9.0$, $10.0$). Thus, P is more precise than Q.
Therefore, both P and Q are equally accurate but P is more precise than Q.
Answer: Both P and Q are equally accurate but P is more precise than Q.
Hence, the correct answer is option: 'B'.