Question

Why do we use quotation marks around the word true in the statement that accuracy refers to how close a measured value is to the "true" value?

Short answer

Because any measurement is subject to error, and some people must measure in order to obtain the "true" value, quotation marks are used around the term true in the statement that accuracy refers to how close a measured value is to the "true" value.

Because a "true" measurement must be taken by someone, and every measurement has some degree of error, true is surrounded by quotation marks.

Step-by-step solution

Definition of accuracy.

Observational error may be measured in two ways: accuracy and precision. Precision is defined as how near or far apart a set of measurements are from their real value, whilst accuracy is defined as how close or far apart the measurements are from each other.

Determine why do we use quotation mark.

Because there is error in any measurement and some must measure to acquire the "actual" value, quotation marks are used around the word true in the statement that accuracy refers to how near a measured value is to the "true" value.

True is surrounded by quotation marks because a "true" measurement must be taken by someone, and every measurement has some degree of inaccuracy.