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 Rose] has ...

Sean Ross is a strategic adviser at 1031x.com, Investopedia contributor, and the founder and manager of Free Lances Ltd. Gordon Scott has been an active investor and technical analyst for 20+ years.

Use our calculator to determine your own survey sample size. Plus, we provide a quick explainer on how to use sampling to improve your customer experience program and rein in fees. “For a precise ...