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Efficiency variance can be a good metric because it measures how efficiently inputs were used to produce output.
Central tendency will only give you information on the location of the data. You also need dispersion to define the spread of the data. In addition, shape should also be part of the defining criteria of data. So, you need: location, spread & shape as best measures to define data.
the assessment step involves the application of quantitative or qualitative measures to determine the probability and severity of ill effects potentially resulting from exposure to a hazard
box and whiskers
A polling company attempts to predict the outcome of a presidential election, but only contacts people who subscribe to major political journals.