Precision is defined as:

Precision is defined as:

• A. The pH of a neutral solution
• B. The substance that dissolves
• C. Closeness of two or more measurements to each other
• D. How close a measurement is to a standard or known value

Answer: (C)

Precision is about repeatability—the consistency of multiple measurements. When you measure the same quantity several times and the results cluster very close together, you’ve achieved high precision. It doesn’t by itself guarantee that those measurements are near the true value, only that they agree with each other. In contrast, accuracy is about closeness to a known standard or true value. The other options describe different ideas: a neutral solution has a pH around 7, which isn’t about how repeatable measurements are; the substance that dissolves is a solute, not a concept about measurement consistency; and measuring how close a value is to a standard describes accuracy, not precision.

Precision is about repeatability—the consistency of multiple measurements. When you measure the same quantity several times and the results cluster very close together, you’ve achieved high precision. It doesn’t by itself guarantee that those measurements are near the true value, only that they agree with each other. In contrast, accuracy is about closeness to a known standard or true value.

The other options describe different ideas: a neutral solution has a pH around 7, which isn’t about how repeatable measurements are; the substance that dissolves is a solute, not a concept about measurement consistency; and measuring how close a value is to a standard describes accuracy, not precision.