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.

How to calculate Standard Deviation in Excel The Standard Deviation is a term used in statistics. The term describes how much the numbers if a set of data vary from the mean.

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.

Key Points Use Excel to calculate daily returns and standard deviation to gauge stock volatility. Annualize volatility by multiplying daily standard deviation by the square root of 252.

Pooled standard deviation is a useful tool when analyzing data sets. It is especially helpful when you’ve taken the time to properly weigh your standard deviations so everything is in balance.

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.