Confidence Interval Output

[DarioSarra]

Would it be possible to document better the Confidence Interval Output? I was expecting a Tuple with 2 values like in HypothesisTests, but I don't understand how should I interpret the third value.

[rofinn]

If I recall the tuple is just (t0, lower_bound, upper_bound) where t0 is just the original metric value? I seem to recall that being useful for plotting where I want to plot the estimate along with the CI bounds.