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The standard deviation is a measure of the spread of the data. As with the mean it comes in a number of flavours.
- Standard deviation of the population
We use this when we know all the outcomes. For example if we have a census (asked everyone) instead of a sample (asked some).
I.e. the standard deviation is the square root of the expected value of the square of the difference between the values and the average.
- Under construction.
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