Google Quantitative Analyst interview questions

I applied online and got an email from recruiter few days later. The phone interview was 45 minutes. The interviewer introduces his team and him self. He asked me statistical questions. I had onsite interview at Mountain view. It took about 4 hours and I met 4 interviewers. They asked programing and statistical questions.

I applied online and got an email from recruiter few days later. Scheduled a phone interview afterwards. The interviewer first introduces his team and then go on asking me statistical questions. I didn't know the answer and struggle for a while. Then he moves on to ask me to explain the algorithms I used before. The phone interview was 45 minutes.