Confidence
Interval
Calculator

Calculate confidence intervals for a population mean from sample mean, standard deviation, and sample size. Supports Z and T distributions.

Sample Mean (x̄)

Standard Deviation (s)

Sample Size (n)

Distribution

Z-distribution (n >= 30)

Margin of Error

1.9600

95% Confidence Interval

[48.0400, 51.9600]

What does 95% confident actually mean, and why is it not what you think?

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ConfidenceIntervalCalculator