Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Somer G. Anderson is CPA, doctor of ...

Marshall Hargrave is a stock analyst and writer with 10+ years of experience covering stocks and markets, as well as analyzing and valuing companies. Dr. JeFreda R. Brown is a financial consultant, ...

Fact checked by Michael RosenstonReviewed by Somer AndersonFact checked by Michael RosenstonReviewed by Somer Anderson Standard deviation and variance are two basic mathematical concepts that have an ...

For a given data set, standard deviation measures how spread out the numbers are from an average value. This measurement of ...

As a business owner, you are constantly figuring out what your current customers want and what your potential customer needs. The data can be tracked in a variety of ways, from polls and surveys to ...