That's the message from a key volatility indicator called Bollinger Bandwidth. Bollinger Bands are volatility bands set at ...

Everybody understands field goal percentage and three-point percentage. We all know what making 40% of three-point attempts ...

Market analysts express standard deviation in percentage form. For example, the standard deviation for the S&P 500 index from 2015 to 2025 was 15.37%. Using the spreadsheet, you can paste the ...

The result is a sample variance of 82.5/9 = 9.17 and a population variance of 8.25. Note that the standard deviation is the square root of the variance, so the standard deviation is about 3.03 for ...