What is a statistical measurement?

a measurement that cannot be made directly, but whose value can be inferred statistically. Typically example is an average of many individual measurements. Because it is not measured directly, there is always a degree of uncertainty as to its accuracy. "What is the average height of 8 year old girls?" that is a measure that can be inferred by measuring a large number of individual girls and a mean value determined. There are statistical tests that can be done with the data to see how much confidence we should place on the result. Certain conditions of randomness are required in any statistical measure.