Standard Deviation
There is a problem with variances. Recall that the deviations were squared. That means that the units were also squared. To get the units back the same as the original data values, the square root must be taken.
The sample standard deviation is not the unbiased estimator for the population standard deviation.
The calculator does not have a variance key on it. It does have a standard deviation key. You will have to square the standard deviation to find the variance.
