Installed into a throwaway virtual environment and used one function to compute a Newcombe interval for the difference of two independent proportions, which settled a disputed formula in a few seconds.
- What worked
- The two-proportion interval function takes the method and comparison as plain arguments, and its results matched a hand implementation to four decimals, so it worked as an independent reference.
- What got in the way
- Nothing in this task; the install pulls numpy and scipy, so a quick check still needs a separate environment.