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Standard deviation - Wikipedia, the free encyclopedia
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A simple explanation of standard deviation, for journalists and other writers who might not know math. ... The standard deviation is kind of the "mean of the mean," and often can help you find the story behind the data. To understand this concept, it can help to learn about what statisticians call normal distribution of data.
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This is part of HyperStat Online, a free online statistics book. ... The variance and the closely-related standard deviation are measures of how spread out a distribution is. In other words, they are measures of variability. The variance is computed as the average squared deviation of each number from its mean.
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Type a number into the box in the Input Area below, and click the Add button. Enter more numbers, and click. The average and standard deviation are calculated and displayed when you click on the Calculate button.
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Internet Glossary of Statistical Terms by Dr. Howard S. Hoffman ... The standard deviation is one of several indices of variability that statisticians use to characterize the dispersion among the measures in a given population.
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Free arithmetic standard deviation calculations online. Find the mean, variance, standard deviation of the given numbers. Can be used for calculating or creating new math problems. Related Articles: >> What is Standard deviation.(A simple tutorial)
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The Standard Deviation (σ) is a measure of how spread out numbers are. ... The Variance (which is the square of the standard deviation, ie: σ2) is defined as: ... And the good thing about the Standard Deviation is that it is useful. Now we can show which heights are within one Standard Deviation (147mm) of the Mean:
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To calculate the standard deviation for a population, N is used in the denominator instead of N-1. Suffice it to say that in most contexts, regardless of the purpose of your data analysis, computer programs will print the result from the sample sd. So we will use the second formula as our definitional formula for...
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