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Standard Deviation: The standard deviation (σ) is the square root of the mean of the sum of the squares of the differences between the mean of that value and the standard deviation corresponding to a normal distribution. The statistical calculation to express the variability or spread of the data is the SD. The greater the spread of numbers in a data set, the greater the standard deviation. It is the square root of the variance. One of the most common statistical terms in analytical chemistry is the population standard deviation of observations. It is also called the root mean square deviation because it is the square root of the mean of the sum of the squares of the differences between the value and the mean of that value and is the special value in connection with the normal distribution.
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