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### Stats20StdDev

Course: CHEM 197, Summer 2011
School: Duke
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Word Count: 756

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Document 6/27/09 Untitled 9:42 PM Lesson 2.4 Variance and Standard Deviation Variance The variance is the average of the squares of the deviations. A deviation is the difference between a value and the mean and is written as: Example: {2, 3, 5, 6} is a set of data. The sample mean is 4. The deviations are: 2 - 4 = -2 3 - 4 = -1 5-4=1 6-4=2 The deviations squared are: (-2) 2 = 4 (-1) 2 = 1 (1) 2 = 1 (2) 2 = 4 An...

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