What value of a measurement must be known if the accuracy of an experimental measurement is to be determined?
One needs to know the normally accepted as correct value.
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To determine the accuracy of an experimental measurement, you need to compare the measured value to the true value. In order to do that, you need to know the true value of the measurement. The true value represents the ideal or correct value that the measurement should be. However, in practice, it is often difficult or impossible to know the true value exactly.
To get as close as possible to the true value, scientists and researchers typically use reference standards or calibration methods. A reference standard is a known and accepted value against which measurements can be compared. By comparing the measured value with the reference standard, you can assess the accuracy of the measurement.
For example, consider a weight measurement. To determine the accuracy of the measurement, you would need to compare it to a known and calibrated weight standard. If the measured weight matches the known weight standard, then the measurement is considered accurate.
In summary, to determine the accuracy of an experimental measurement, you need to compare it to a known and accepted reference standard or true value.