US Census Bureau

http://www.census.gov/eos/www/naics/

Visit the US Census Bureau website, where you can find information on new industries and sectors, and a full explanation of NAICS coding.

www.audiencedialogue.net/gloss-quant.html

This page can also be used as a quick reference guide to key terms used in sampling. It is part of the audience dialogue site which aims to provide information to organisations that wish to use research based approaches to communication.

Sampling Tool

https://www.randomizer.org/

Use this site to generate a random sample as well as viewing some examples of how random sampling can work.

Sampling size calculator

https://www.surveysystem.com/sscalc.htm

Use this site to determine how many people you need to interview in order to get the results that should reflect the target population as precisely as needed. You can also find the level of precision that you have in an existing sample.