Amazon Data Scientist interview questions

It was a first-round phone interview. I applied the job online and waited for about 2 weeks. A recruiter arranged the by giving me a table to fill my free time slots in the next 3 weeks and arranged my interview by the nearest time slot, which indicates that if you want more time to prepare you can simply say you are not free in the first one or two weeks. There was no general questions in the interview. The interviewer directly asked what I'm studying and relevant questions about speech technology, which are listed below.