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the line that best fits the data, calculated according to the least squares method of regression.
a cone with the line from the vertex to the centre of the base perpendicular to the base.
a measure of dispersion of a data set which is equal to the square of the standard deviation....
in set theory, a union between two or more data sets refers to all the elements in the data sets...
represents the rate of change or gradient of a function at any particular point.
in a histogram, the frequency density corresponds to the height of each bar.