Welcome to your interview.
The question is on your right: Statistical Significance in Device Experiments. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
What does statistical significance mean, and how would you explain it in the context of an experiment on connected devices?