Calculate Minimum Sample Size for a Survey or a Poll with Three Confidence Levels
Published in May 2010Filed as : Statistics
ShareThisThis tool calculates the minimal size of a sample with three confidence levels based on accuracy of the true proportion of data. This can be very useful to estimate the size of survey and poll samples needed to produce useful results.
Only one variable is necessary for this calculation and that is the accuracy within the true proportion. Common settings are 95% (0.05), 98% (0.02) or 99% (0.01). Numbers higher than or equal to 100% result in INFINITY and therefore we recommend you use accuracy somewhere between 0 and 100%.
Demonstration data:
- Demo A: Web site owner wants to run a poll among his/her users to find out if the new site design is a hit or miss. He/she wants the poll to be 95% confident on the probability of a hit or miss and be 95% accurate of the true proportion.
- Demo B: Another Web site owner wants to run a similar poll, but his/hers Web site is highly popular and he/she wants to be very confident, 99%, on the probability and 99% on the accuracy.
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Introduction
