"Certainty" appears in the abstract! But yes, the article is talking about the work required to derive a 95%-confident result of a specific improvement. But that's backwards, and not how one does statistics. You measure an effect, and then compute its confidence.
And it's spun anyway, since most of those "trillions of miles!" numbers reflect things like proving 95% confidence of 100%+ improvements in safety. When all we really want to know to release this to the public is 95% confidence of 0% improvement (i.e. "is it not worse?").
And it's spun anyway, since most of those "trillions of miles!" numbers reflect things like proving 95% confidence of 100%+ improvements in safety. When all we really want to know to release this to the public is 95% confidence of 0% improvement (i.e. "is it not worse?").