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ZTEST
The ZTEST function returns the one-tailed probability value of the Z-test.
ZTEST(value-set, value, stdev)
value-set: A collection of number values, date/time values or duration values. All values must be of the same value type.
value: The value to test. value is a single number value, date/time value or duration value.
stdev: An optional number value for the standard deviation of the population. stdev must be greater than 0.
Notes
The Z-test is a statistical test that determines if the difference between a sample mean and the population mean is large enough to be statistically significant. The Z-test is used primarily with standardised testing.
If stdev is omitted, the assumed sample standard deviation is used.
Example |
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Suppose that cells B2 to G2 contain the values 57, 75, 66, 98, 92 and 80, respectively, and represent the value-set. The ZTEST value for this set, assuming a value to test (value) of 70 and a standard deviation (stdev) of 9, can be found with the formula: =ZTEST(B2:G2, 70, 9) The result is 0.0147281928162857. |