Your question is Ensuring A/B Test 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).
How do you ensure the statistical significance of your A/B tests?
Explain the complete process, from hypothesis formulation and sample-size planning through test execution, statistical testing, and interpretation. Include how you control false positives, assess practical significance, and account for repeated looks at the data or multiple comparisons. Use the illustrative figures in the solution fields to demonstrate the calculations.