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.

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.

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

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.