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To calculate sample size, first find the population size, or number of people taking your study, and margin of error, which is the amount of error you'll allow in your results.
This free sample size calculator determines the sample size required to meet a given set of constraints. Also, learn more about population standard deviation.
There are many established guidelines and formulas that can help you in determining the right sample size. The easiest way to define your sample size is using a sample size calculator , or you can use a manual sample size calculation if you want to test your math skills.
To learn more about determining how to find a sample size, read my following articles: How to Calculate Sample Size; What is Power in Statistics? Sample Size Summary. Understanding the implications of sample size is fundamental to conducting robust statistical analysis.
Cochran’s Sample Size Formula. The Cochran formula allows you to calculate an ideal sample size given a desired level of precision, desired confidence level, and the estimated proportion of the attribute present in the population.
We can use these pieces to determine a minimum sample size needed to produce these results by using algebra to solve for \(n\): Finding Sample Size for Estimating a Population Proportion \(n=\left ( \dfrac{z^*}{M} \right )^2 \tilde{p}(1-\tilde{p})\)
Calculate sample size with our free calculator and explore practical examples and formulas in our guide to find the best sample size for your study.