Z.TEST(array, x [,sigma])
Returns the two-tailed p-value of a z-test.
|array||The array or range of data against which to test x.|
|x||The value to test.|
|sigma||(Optional) The population (known) standard deviation.|
|* Added in Excel 2010.|
* This function replaces the ZTEST function.
* For the Microsoft documentation refer to support.office.com
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