Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Thomas J. Brock is a CFA and CPA with more ...

A random number generator (or equivalent process) is used to select all sampling locations. Can be used for any objective: estimating/testing means, comparing means, proportions, etc., of two or more ...

Using professional judgment does not mean you must take judgmental samples. Implementation of a judgmental sampling design should not be confused with the application of professional judgment (or the ...