Statistics

Sample size calculation

This calculator determines the sample size necessary to estimate a population proportion within a specified margin of error
http://www.pivotalresearch.ca/resources-sample-calc.php

Raosoft

http://www.raosoft.com/samplesize.html

surveymonkey
https://www.surveymonkey.com/

Confidence interval
http://www.abs.gov.au/websitedbs/a3121120.nsf/home/statistical+language+-+measures+of+error

Statistical power
http://www.statisticallysignificantconsulting.com/PowerAnalysis.htm

Statistic glossary
http://www.abs.gov.au/websitedbs/a3121120.nsf/home/statistical+language+-+statistical+language+glossary