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Definitions:
Standard Deviation
A gauge for assessing the spread or differentiation of values within a group of data points.
Variance
A measure of the spread of a set of values, calculated as the average of the squared deviations from the mean.
Population Mean
The average of all the values in a population, calculated by summing all the values and dividing by the count of values.
Sample Mean
The average value computed from a sample of data, used to estimate the population mean.
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