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Confidence Interval for Proportions

Calculate the confidence interval of a proportion with the given inputs of sample size, frequency and chosen confidence level.

Related Calculators


Population Confidence Interval for Proportions Calculation

Confidence Level = %
Sample Size (n) =
Frequency (x) =


Confidence Interval for Proportion = < P <

 
   
  
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Formula Used
Confidence Interval = p ± Zα/2 × √[(p×q)/n] , (x, n-x≥5)

Where,
    p = x/n
    q = 1-p
    α = 1 - (Confidence Level/100)
    x = Frequency
    n = Sample Size
    Zα/2 = Z-table value

Online calculation of Population Confidence Interval for Proportions is made easier.