Bristol Myers SquibbMediumStatistics & Probability00:00

Welcome to your interview for the Data Scientist role at Bristol Myers Squibb.
The question is on your right: Statistical Significance for Metric Changes. 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. You have three graded attempts to score 7/10 or better.
How would you determine whether an observed change in a metric is statistically significant?