Learn how to calculate Standard Deviationin Excel. The STDEV function can be used to estimate standard deviation based on sample in Excel.

Calculate your T-Value by taking the difference between the mean and population mean and dividing it over the standard deviation divided by the degrees of freedom square root.

Because standard deviation is based on averaging the data, the more history you have, the more accurate the calculation will be. Select any cell where you want the standard deviation to appear.

Learn the standard deviation formula, how to calculate it, and its importance in data analysis. Step-by-step guide with examples.

Understanding standard deviation means first understanding variance because standard deviation, mathematically speaking, is the square root of variance.

Annualized volatility = standard deviation (volatility) multiplied by the square root of the periods in the year. For example, you might calculate the volatility of daily stock returns.