Standard deviation establishes the average spread of individual values from the mean for a group. Standard deviation ... as the square root of the variance. If data points are far from the mean ...

filadendron / Getty Images Standard deviation ... there is data from the entire population being studied or considered. The mean is the average of a group of numbers and the variance measures ...

The pooled standard deviation is the way to go. Let’s see how. The definition of the standard deviation is the average distance each data ... of the group, S squared the group variance, and ...