Standard Deviation & Variance
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9 Terms
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Variance
Measure of how data points vary from the mean
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Variance
A measure of how far a set of data are dispersed out from their mean or average value
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Variance
It is denoted as “σ2”
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Non-negative
Variance is always _____ since each term in the variance sum is squared and therefore the result is either positive or zero
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squared
Variance always has _____ units.
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Standard Deviation
The measure of the distribution of statistical data
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Standard Deviation
It is denoted by the symbol “σ”
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Variance
Is equal to the average squared deviations from the mean, while standard deviation is the number’s square root.
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Standard Deviation
The square root of variance
Note 
Flashcards (20)