What does percent error measure in a given value?

Percent error measures the accuracy of a value by comparing it to an expected or true value. It quantifies how much a measured or calculated value deviates from the actual or accepted standard, providing insight into the reliability of the measurement. The formula for calculating percent error is typically given by the absolute error (the difference between the measured value and the expected value) divided by the expected value, multiplied by 100 to convert it into a percentage.

This measurement is especially useful in scientific experiments and calculations, as it allows for an easy interpretation of how accurate the measurements are in relation to what was anticipated. In contexts where precision is important, percent error serves as a crucial indicator of the effectiveness of processes or methodologies. The focus on accuracy makes this option the correct answer, as it clearly defines the purpose of percent error in assessing the fidelity of measurements.