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Deviation

Standard Deviation

Subject: 
Statistics
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Statistics
Data analysis
Summary statistics
Probability theory
Variance
Standard deviation
Deviation
measurement
Bessel's correction
Analysis of variance

The Standard Deviation is a measure of how spread out numbers are. Its symbol is???(the greek letter sigma) The formula is easy: it is the?square root?of the?Variance Variance = The average of the?squared?differences from the Mean. To calculate the variance follow these steps: Work out the Mean (the simple average of the numbers) Then for each number: subtract the Mean and square the result (the squared difference). Then work out the average of those squared differences. (Why Square?)
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