In this context, "measured" means quantifying or assessing something using systematic methods or tools in order to obtain reliable data or information.
Related terms
Sampling: Sampling is the process of selecting a representative subset from a larger population for research or survey purposes.
Margin of Error: The margin of error is the range within which the true value of an estimate or measurement is likely to fall due to sampling variability.
Data Collection Methods: Data collection methods are various techniques used to gather information, such as surveys, interviews, focus groups, and experiments.