Standard Deviation Calculator: Variance & SD
Calculate Variance and Standard Deviation (Population & Sample).
Understanding Standard Deviation
Standard Deviation is a measure of the amount of variation or dispersion of a set of values. A low standard deviation indicates that the values tend to be close to the mean, while a high standard deviation indicates that the values are spread out over a wider range.
Statistics FAQs
What is the difference between Population and Sample SD?
Population SD divides by 'N' (total count), while Sample SD divides by 'N-1'. Sample SD is used when your data represents a portion of a larger category.