Returns the one-tailed P-value of a Z-test with standard distribution.

Sample Usage




ZTEST(data, value, [standard_deviation])

  • data - The array or range containing the dataset to consider.

  • value - The test statistic to use in the Z-test.

  • standard_deviation - [ OPTIONAL ] - The standard deviation to assume for the Z-test. If this is not provided, STDEV(data) will be calculated.


  • The P-value returned by ZTEST is the probability that a value chosen at random from data is at least as extreme (that is, as far from the mean) as value.

See Also

NORMSDIST: Returns the value of the standard normal cumulative distribution function for a specified value.

NORMDIST: The NORMDIST function returns the value of the normal distribution function (or normal cumulative distribution function) for a specified value, mean, and standard deviation.

CONFIDENCE: Calculates the width of half the confidence interval for a normal distribution.


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