I had two rounds phone interview. The interviwer asked me several basic probabality questions. This took 2 weeks. And then I fly to Chicago for the onsite. The onsite firstly had a written test. The test was difficult and impossible to finish in 1 hour. Then three rounds in person interview. questions about statistis.

The first round was four statistics questions. Two of them were basic stat questions and the next two were case studies (one of them was intermediate the other one was difficult)