https://www.investopedia.com/terms/s/samplingerror.asp
Sampling Errors in Statistics: Definition, Types, and Calculation
A sampling error is a statistical error that occurs when a sample does not represent the entire population. See how to avoid sampling errors in data analysis.
statistics definition types
https://www.investopedia.com/terms/s/statistics.asp
Statistics: Definition, Types, and Importance
Statistics is the collection, description, and analysis of data, and the formation of conclusions that can be drawn from them.
statistics definition types