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]