![]() Where Z(0.95) is the z-score corresponding to the confidence level of 95%. Margin of error = standard error * Z(0.95) ![]() Then you can calculate the standard error and then the margin of error according to the following formulas: Calculating the confidence interval requires you to know three parameters of your sample: the mean ( average) value, μ, the standard deviation, σ, and the sample size, n (number of measurements taken).
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