An example of a simple random sample would be to choose the names of 25 employees out of a hat from a company of 250 employees. ... Example: Your sample size will be 20 companies from the S&P 500.

Simple random sampling takes a small sample size from a larger population in order to analyze ... With a simple random sample, ... the ratio should be 10% (2,000 people out of 20,000, for example).

Selecting a random sample from a set is simple. But what about selecting a fair random sample from a set of unknown or indeterminate size? That’s where reservoir sampling comes in, and [Sam ...

Woolson, Bean, and Rojas (1986, Biometrics 42, 927-932) present a simple approximation of sample size for Cochran's (1954, Biometrics 10, 417-451) test for detecting association between exposure and ...