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Confidence Interval Calculator

Calculate confidence intervals for a proportion or mean.

Sample size (n)

Successes (x)

Confidence level

95% Confidence Interval

(0.4192, 0.4808)

0.41920.450.4808

Estimate (p̂ or x̄)

0.45

Std Error (SE)

0.01573

Margin of Error

± 0.03083

z* (critical)

1.96

Lower bound

0.4192

Upper bound

0.4808