This function returns the significance value of a z-test. The z-test generates a standard score for x with respect to the set of data and returns the two-tailed probability for the normal distribution.

Syntax

ZTEST(array,x,sigma)

Arguments

This function has these arguments:

Argument	Description
array	Array of data to test
x	Value at which to test
sigma	[Optional] Known standard deviation for the population; if omitted, the calculation uses the sample standard deviation

Remarks

If sigma is not specified, the calculated standard deviation of the data in array is used.

The equation for calculating the z-test is as follows, where n is the number of data points.

Data Types

Accepts numeric data for all arguments. Returns numeric data.

Examples

ZTEST(A2:D12,40,0.877)

ZTEST(R2C1:R12C4,2)

ZTEST({5,10,15,12,11,8,16,7},10) gives the result 0.355512703503418

ZTEST({5,10,15,12,11,8,16,7},10,3) gives the result 0.318675944098237

Version Available

This function is available in product version 1.0 or later.

See Also

FTEST | TTEST | Statistical Functions