The percent of an accepted value an error represents
precision
accuracy
percent error
significant figures

Percent error is the percent difference between a measured and expected value. (image: Sherman Geronimo-Tan)

Percent Error Definition

Percent error, sometimes referred to as percentage error, is an expression of the difference between a measured value and the known or accepted value. It is often used in science to report the difference between experimental values and expected values.

The formula for calculating percent error is:

Note: occasionally, it is useful to know if the error is positive or negative. If you need to know the positive or negative error, this is done by dropping the absolute value brackets in the formula. In most cases, absolute error is fine. For example, in experiments involving yields in chemical reactions, it is unlikely you will obtain more product than theoretically possible.

The correct answer is "Percent error".

Explanation:

Percent error is the difference between the estimated number and the experimental number expressed in percent format. The percent error gives information about how different is what was estimated and the actual number. Usually a certain value of percent error is accepted, therefore the percent error could be defined as the percent of an accepted value and the error it represents.