01 What statistical software programs do you have experience using in past positions in this field? Which one do have you the most experience with or feel the most confident using? DATA SCIENTIST 02 Here at Robinhood, we use several programming languages to create our software. What programming languages do you have experience using? Of these, which do you have the most experience with? Which do you have the least experience with? DATA SCIENTIST 03 To be a successful Data Scientist, many in the industry believe it is important to keep up-to-date on the newest technologies and methodologies. What new data-related technology/methodology have you heard of that you wish you could learn more about? DATA SCIENTIST 04 The work of a Data Scientist can have a large impact on the strategy, and ultimate success, of Robinhood's business. Is there a time you felt your work impacted your company's strategy development? Explain your role and contribution. DATA SCIENTIST 05 When your job requires you to be immersed in data, you can discover some interesting patterns or trends. What is the most interesting discovery you made through the mining/exploration of data? DATA SCIENTIST 06 What data visualization tools do you have experience using? Which one is your favorite to use and why? DATA SCIENTIST 07 Describe to me a data project you worked on in the past that you would do differently with the knowledge/experience you have acquired up to this point and/or new technology that was not available at the original time of the project. DATA SCIENTIST 08 Describe a time when you had to present findings/recommendations to a non-technical audience. What strategies did you use to ensure the audience clearly understood the message and did not get confused? DATA SCIENTIST 09 Robinhood is in the process of implementing machine learning in our applications. Describe to me your experience with machine learning methods. Is there a particular method you have more experience with than others? DATA SCIENTIST 10 In your past positions, have you had experience contributing to the improvement of data analysis processes, database management, data infrastructure, or anything along those lines? If so, please explain your contributions. DATA SCIENTIST 11 Data visualization is an important skill that is used often here at Robinhood when communicating results with stakeholders. Describe to me one of your most innovative data visualization ideas that went beyond pie and bar charts. DATA SCIENTIST 12 What experience do you have conducting text analytics? Describe a project you worked on that required text analytics. DATA SCIENTIST 13 How have past positions unrelated to data analysis helped you in your current profession as a Data Scientist? How will this help you to be successful here at Robinhood? DATA SCIENTIST 14 Many companies rely on Data Scientists to tell them what analysis is possible with the data available. Talk about a time when you took the initiative to recommend a new business measure for the company to track. DATA SCIENTIST 15 Describe a project where you had a surprisingly difficult time dealing with unstructured data. How did you overcome the obstacles and what tools did you use? DATA SCIENTIST 16 Data Scientists do a lot of exploring and testing of hypotheses. Tell me about a time when you were given the freedom to explore a business problem with very few parameters. What was your initial approach to attacking this project? DATA SCIENTIST 17 Here at Robinhood, we use several programming languages to create our software. Can you compare SAS, R, and Python programming tools and describe their use in Data Analytics? DATA SCIENTIST 18 As a Data Scientist, how do you employ statistics to analyze data and develop business recommendations? DATA SCIENTIST 19 What is Data Cleansing and why is it important in Data Analysis? DATA SCIENTIST 20 Can you describe how Data Analysis is used by businesses and other organizations like Robinhood? DATA SCIENTIST 21 Can you describe some of the steps you take to ensure that a regression model fits the data? DATA SCIENTIST 22 What is a decision tree, and how would you use this in your job as a data scientist here at Robinhood? DATA SCIENTIST 23 Do you follow the hypothesis that many small decision trees are more accurate than one large one? DATA SCIENTIST 24 In your opinion, is mean square error a good or bad measure of model performance? DATA SCIENTIST 25 What are some of the assumptions required to accurately perform a linear regression analysis? DATA SCIENTIST 26 Do you perform data wrangling and data cleaning before applying machine learning algorithms to your data analysis? DATA SCIENTIST 27 Can you discuss some of the weaknesses of a linear analysis model? DATA SCIENTIST 28 How do you deal with an unbalanced binary classification when analyzing a data set? DATA SCIENTIST 29 What are some of the differences between a histogram and a box plot? DATA SCIENTIST 30 Can you define cross-validation and describe how you use this process when analyzing a data set? DATA SCIENTIST