rename: k -> digits and crosstabs defaults to two-sided alternative hypothesis

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (fae7597) to head (845c625).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #271 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 14 14 Lines 495 495 ========================================= Hits 495 495 ```

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