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This free sample size calculator determines the sample size required to meet a given set of constraints. Also, learn more about population standard deviation.
You can use this free sample size calculator to determine the sample size of a given survey per the sample proportion, margin of error, and required confidence level
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.
Calculator to determine the minimum number of subjects to enroll in a study for adequate power.
Normal probability calculator for sampling distributions: use your sample size, along with the population mean and standard deviation, to find the probability that your sample mean falls within a specific range.
If you want an easier option, Qualtrics offers an online sample size calculator that can help you determine your ideal survey sample size in seconds. Just put in the confidence level, population size, margin of error, and the perfect sample size is calculated for you.
Calculate power & sample size for one-sample, two-sample and k-sample experiments. Advanced power and sample size calculator online: calculate sample size for a single group, or for differences between two groups (more than two groups supported for binomial data).
This sample size calculator enables you to calculate the minimum sample size and the margin of error. Learn about sample size, the margin of error, & confidence interval.
This calculator allows you to determine an appropriate sample size for your study, given different combinations of confidence, precision and variability. For large populations, it uses Cochran's equation to perform the calculation.
Sample size calculator. Calculates the sample size for a survey (proportion) or calculates the sample size for a normal confidence interval.