the interviewer started by talking about the internship, the responsibilities and duties, and possible promotions. then he started the techniques questions part. he asked about 5 big questions, all relevant to statistics. I would say at least mediate level of statistics. The easiest questions is to interpret a 95% confidence interval; while the hardest one is asking how to deal with a very large data, like what is your thought process and what techniques you might want to use. I did not get a feedback on my answers so i did not know whether my answer is correct or not.

30 mins phone interview and almost technical questions. I was invited to tell about the project I have done before and ask some questions regarding this project. Also, my programming language level was asked. There were also some standard technical questions like p-value, overfitting, cross-validation.