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Dark blue is less than one standard deviation from the mean. For the normal distribution, this accounts for 68.27% of the set; while two standard deviations from the mean (blue and brown) account for 95.45%; and three standard deviations (blue, brown and |
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There are 7 summaries on Standard deviation.
Encyclopedia and Summary Information
summary from source:
 Standard Deviation Summary
578 words, approx. 2 pages
 The standard deviation is a statistical measure of the dispersion or uncertainty in a random variable. The standard deviation is the square root of the variance, a measure of how spread out a distribution is, and is written for a random variable x as:... summary from source:
 Standard Deviation Summary
86 words, approx. 0 pages
A term used in statistics to indicate a measure of variability among the values of a frequency distribution. For example, when indicating the range or scatter of scores from the mean or average, it is sometimes convenient to express the extent of... summary from source:
Standard Deviation Summary
50 words, approx. 0 pages
A measure of the dispersion of values of a variable about its ARITHMETIC MEAN that is calculated as the square root of the sum of the differences between each of those values and the arithmetic mean divided by the number of values minus one. See also:... summary from source:
Standard Deviation Summary
44 words, approx. 0 pages
A statistic that shows the spread or dispersion of scores in a distribution of scores. It is calculated by taking the square root of the variance. It is applicable to all kinds of repeated measurements, e.g., between-batch, within-batch, repeatability,... summary from source:
Standard Deviation Summary
36 words, approx. 0 pages
The root of the average of the squares of the differences from their MEAN of a number of observations. It is a measure of the spread of a number of observations from their... summary from source:
Standard Deviation Summary
23 words, approx. 0 pages
A measure of the dispersion of the data about the mean value. The square of the standard deviation is the... summary from source:
 Standard deviation Summary
3,556 words, approx. 12 pages
In probability and statistics, the standard deviation of a probability distribution, random variable, or population or multiset of values is a measure of the spread of its values. It is usually denoted with the letter σ (lower case sigma). It is... 
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