A reported "+8% lift" with a confidence interval of −2% to +18% is a coin flip, not a win.
The point estimate is the least informative number in the result. The interval tells you what you actually know.
— If the CI crosses zero, you cannot rule out that the change did nothing.
— A tight +1% beats a wide +8% for a launch decision.
Ship on the lower bound, not the headline.
Read the number, not the story. [95% CI · lower-bound rule]