Confidence Interval Calculator
Calculate a confidence interval for a sample mean at 80–99% confidence levels.
95% Confidence Interval
94.6323 to 105.3677
Margin of error: ± 5.3677
So funktioniert's
Margin of error = z-score × (standard deviation / √sample size), added and subtracted from the sample mean.
Which confidence level should I use?
95% is the most common default in research and reporting; higher levels (98%, 99%) give a wider, more conservative interval.