Question library
Questions from real interviews. Drill any of them by voice in a couple of minutes, with an interviewer, a score and feedback.
What is a confidence interval, and how do you interpret it correctly?JuniorYou need to estimate the average order value and give a confidence interval, but the distribution of orders is heavily skewed, with rare very large purchases. How would you calculate it, and what would you tell the client?Mid-levelYour key metric is average order value, and it has a very heavy right tail: a few percent of customers bring in half the revenue. How would you build a confidence interval for the difference in means between two groups?Senior