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Calculates the z-Test of two data samples.
For more information on Z-tests, refer to the corresponding Wikipedia article.
Variable 1 range: The reference of the range of the first data series to analyse.
Variable 2 range: The reference of the range of the second data series to analyse.
Results to: The reference of the top left cell of the range where the test will be displayed.
The following table shows the z-Test for the data series above:
| z-test | ||
| Alpha | 0.05 | |
| Hypothesised Mean Difference | 0 | |
| Variable 1 | Variable 2 | |
| Known Variance | 0 | 0 | 
| Mean | 16.9230769231 | 20.4615384615 | 
| Observations | 13 | 13 | 
| Observed Mean Difference | -3.5384615385 | |
| z | #DIV/0! | |
| P (Z<=z) one-tail | #DIV/0! | |
| z Critical one-tail | 1.644853627 | |
| P (Z<=z) two-tail | #DIV/0! | |
| z Critical two-tail | 1.9599639845 |