Your question is Evaluating Observed Lift Significance. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You observe a lift in a treatment group relative to a control group after running an experiment. You need to decide whether that lift reflects a real effect or random variation in the sample.
How would you determine whether an observed lift is statistically significant?