One Sample Z-Test Calculator

A one sample z-test is used to test whether or not the mean of a population is equal to some value when the population standard deviation is known.

To perform a one sample z-test, simply fill in the information below and then click the “Calculate” button.

Enter raw data

Enter summary data

301, 298, 295, 297, 304, 305, 309, 298, 291, 299, 293, 304

σ (population standard deviation)

μ₀ (hypothesized population mean)

z = 0.3232

p-value (one-tailed) = 0.1245

p-value (two-tailed) = 0.3232