Suppose you are working for an e-commerce company and the marketing team is trying to decide if they should launch a new webpage. They ran an A/B test and need help analyzing the results. They provided you with this dataset, which contains the following fields:

• user_id: the user_id of the person visiting the website
• timestamp: the time in which the user visited the website
• group: treatment vs control, treatment saw the new landing page, control saw the old landing page...