1) You are the CEO of a large technology company. Most projects in your company are conducted under team-based organisational structures. You ask your data science team to investigate whether teams with a leader perform better than teams without a leader. They find that indeed teams that have a leader are more likely to complete projects on schedule than teams without a leader. a) Based on this data, can you conclude that assigning leaders to teams would increase the performance of the teams in your company? (1 mark) b) Suppose you are interested in establishing a causal link between having a leader and team performance in your company. Describe how you might be able to use any two of the four empirical methods (randomised experiment, instrumental variable, difference-in-differences, regression discontinuity) presented in the lectures for this purpose. For each method, describe the data you would need and discuss the potential limitations/challenges of applying that method. (4 marks)