Sample Size Calculation Using Confidence Interval

Sample Size Calculation Using Confidence Interval. The margin of error portion of a confidence interval formula can also be used to estimate the sample size that needed. This statistics video tutorial explains how to calculate the sample size given the confidence level and margin of error.

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The larger your sample size, the more sure you can be that their answers truly reflect the population. Known confidence interval and width (known population standard deviation). For example, if you used a 95 percent confidence level, meaning that you can say .

This indicates that for a given confidence level, the .

This indicates that for a given confidence level, the . Known confidence interval and width (known population standard deviation). Then we can find the sample size to yield an interval with that confidence level and with a half width not more than the specified one. Taking the commonly used 95% confidence level as an example, if the same population were sampled multiple times, and interval estimates made on each occasion, .