https://www.surveymonkey.com/mp/sample-size-calculator/
Sample Size Calculator: Understanding Sample Sizes | SurveyMonkey
Find out if you have enough people to take your survey. Our sample size calculator can help determine if you have a statistically significant sample size.
www.surveymonkey.com
http://www.raosoft.com/samplesize.html
Sample Size Calculator by Raosoft, Inc.
If 50% of all the people in a population of 20000 people drink coffee in the morning, and if you were repeat the survey of 377 people ("Did you drink coffee this morning?") many times, then 95% of the time, your survey would find that between 45% and 55% o
www.raosoft.com
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