Accuracy is defined as:

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

Answer: (A)

Accuracy tells you how close a measured value is to the true value or a standard. It reflects how correct the measurement is. In contrast, precision describes how close repeated measurements are to each other, regardless of whether they hit the true value. The other statements describe a substance that dissolves (the solute) and the pH of a neutral solution, which are not definitions of accuracy. So accuracy is defined by how close the measurement is to the known value.