Fix bayes intervals for binry design

[codecov[bot]]

Codecov Report

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

Project coverage is 87.04%. Comparing base (89a4194) to head (d698702).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #45 +/- ## ========================================== + Coverage 86.89% 87.04% +0.14% ========================================== Files 47 47 Lines 3366 3366 ========================================== + Hits 2925 2930 +5 + Misses 441 436 -5 ```

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