Define and explain the calculation of variance and the difference between population and sample variance.
1) subtract the mean from each score (result is a standard deviation)
2) average the deviations (if the average is large we have variability)
3) if deviations have minus signs square them
4) the average of the squared deviations if variance
Population Variance - all members of a specific group. Sample Variance - a part of a population that is used to describe the characteristics of the whole population
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