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Statistical Measure of Data

Statisticians utilize various kinds of measurements based on
the collected data as an initial step towards developing
inferences on the population from which observations were taken.
Some measures reflect, in a sense, the center or middle point of
a set of data; others provide a measure of the variability of the
data. These measures can apply to either the population as a
whole or to a sample taken from the population.

Subject X2: 

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