Confidence Interval Calculator
Compute confidence intervals for a sample mean or proportion at any confidence level using the normal approximation
95% confidence interval
Point estimate
50.0000
Margin of error
±3.5784
Standard error
1.825742
z*
1.9600
Uses normal approximation (good for n ≥ 30 mean, np≥10 and n(1-p)≥10 proportion).
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