One Proportion Z-Test Calculator

A one proportion z-test is used to compare an observed proportion to a theoretical one. The test statistic is calculated as:
z = (p-p0) / √(p0(1-p0)/n)
where:
  • p = observed sample proportion
  • p0 = hypothesized population proportion
  • n = sample size
To perform a one proportion z-test, simply fill in the information below and then click the “Calculate” button.

z-statistic: 0.55487

p-value (one-tailed): 0.28949

p-value (two-tailed): 0.57898

95% C.I. = [0.2914, 0.6486]

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