▼ Software. Sample Size Calculator. This Sample Size Calculator is presented as a public service of Creative Research Systems survey software. You can use it to determine how many people you need to interview in order to get results that reflect the target population as precisely as needed. You can also find the level of precision you have in an existing sample. Before using the sample size calculator, there are two terms that you need to know. These are: confidence interval and confidence level. Enter your choices in a calculator below to find the sample size you need or the confidence interval you have. Sample Size Calculator Terms: Confidence Interval & Confidence Level The confidence interval (also called margin of error) is the plus-or-minus figure usually reported in newspaper or television opinion poll results.
The confidence level tells you how sure you can be. Factors that Affect Confidence Intervals There are three factors that determine the size of the confidence interval for a given confidence level: Sample Size. SmartSurvey: Online Survey Software & Questionnaire Tool. ↂ OpinionPanel. ↂ e-Rewards. Paid surveys. UK PAID SURVEYS. InboxPounds® - Earn Cash for E-Mail, Surveys, Games, and More! SurveyMonkey. QuestionPro. Surveys.co.uk. CRT ViewPoint. KwikSurveys. Zoomerang. SurveyGizmo. Survey Analytics. Change.org - petition. Business Opinions. Www.businessopinions.co.uk. Trustpilot. Quora - The best answer to any question.
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