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 Description  
 Standard Deviation:  A measure describing how close members of a data set are in relation to each other.
The standard deviation is the square root of the variance, also known as the mean of the mean. The standard deviation can be found by taking the square root of the variance. For the data set {1,2,3}
the biased variance and standard deviation are:

The standard deviation is the square root of the variance, which equals…



the unbiased variance and standard deviation are:

The standard deviation is the square root of the variance, which equals…



Looking at the bell curve below, 68% of the data will fall within one standard deviation from the mean.