Standard detion is the measure of:
Chance
Central tendency
Detion from mean value
None
STANDARD DETION (SD) SD is the measure of Detion from mean value. SD is most common and generally most appropriate measure of dispersion SD is defined as the 'root-mean-square (RMS) detion of the values from their mean', or as the square root of the variance SD calculation: =
Normal Distribution, Skewed Distributions