Tính toán cỡ mẫu online
1. http://www.surveysystem.com/sscalc.htm
2. http://www.raosoft.com/samplesize.html
3. http://www.nss.gov.au/nss/home.nsf/pages/Sample+size+calculator
4. http://www.calculator.net/sample-size-calculator.html
5. https://www.surveymonkey.com/mp/sample-size-calculator/
6. https://fluidsurveys.com/survey-sample-size-calculator/
Phần mềm tính toán cỡ mẫu
1. http://www.ncss.com/software/pass/?gclid=Cj0KEQiAyvqyBRChq_iG38PgvLgBEiQAJbasd8InJvBLBx5BZyQMMpsjhtA0Kts80z14lVgleoVi70QaAsV68P8HAQ
2. http://www.who.int/chp/steps/resources/sampling/en/