Formally, the standard deviation is the square root of the variance. The variance is the mean of the squares of the difference between each observation and their mean value.
An easier to remember form for variance is: the mean of the squares minus the square of the mean.
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The standard deviation of the population. the standard deviation of the population.
The standard deviation is 0.
The standard deviation in a standard normal distribution is 1.
You need more than one number to calculate a standard deviation, so 9 does not have a standard deviation.
Yes