Understanding Standard Deviation and Variance
Standard deviation is a fundamental measure of statistical dispersion. It quantifies how spread out numbers in a data set are from their arithmetic mean.
- Low Standard Deviation: Indicates that data points tend to be close to the mean.
- High Standard Deviation: Indicates that data points are spread out over a wider range of values.
Sample vs. Population
- Use Sample Standard Deviation (s) when working with a sample subset selected from a larger group.
- Use Population Standard Deviation (σ) when you have data for every member of the entire population.