Google Quantitative Analyst Interview Questions

Updated Jun 24, 2015
24 Interview Reviews

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Quantitative Analyst Interview

Anonymous Employee in Mountain View, CA
No Offer
Positive Experience
Difficult Interview

Application

I applied online. The process took 4+ weeksinterviewed at Google (Mountain View, CA).

Interview

I applied online. The same day a recruiter reached out asking to answer a few technical questions via email. A day after I had replied, I was told I was moving forward to a phone screening.
This was a mix of SQL coding and probability questions. I don't think I did great, but good enough to be moved forward to a second phone screening. This one was much more heavily geared towards machine learning. Essentially I was presented with a scenario (a typical "a software engineer hands you over a dataset") and we spent most of the interview brainstorming about how to go about analyzing and eventually building a ML model out of the data.
A couple of days later I was told I was invited to Google Headquarters. They had a specialist help me with travel arrangements. All very simple and smooth, even when I asked to make changes to my original plan.
One thing you have got to make sure you pay attention to is that commute is horrible and you need plenty time to get from the hotel to Google. Even 10 miles can take 40 minutes.
The onsite interview was very intense. These are 45 minutes back to back interviews, 100% technical with no frills such as intros, what his job is, do you have any questions. They covered pretty much everything from basic probability, to machine learning, to coding (I chose Python), to sampling, A/B testing, time series, SQL,...
Most folks were nice, I only got one person who gave me the impression he hated to be in that room spending time interviewing.
This wasn't as hard as I thought it would be, yet the breadth of the knowledge makes it very difficult to prepare well. Some of these questions seem to be geared more towards newly grads. I got a couple of questions I would have nailed after I left college 10 years ago, but have not touched in a business setting for years. So, long story short, have your basics covered.
The only thing I can complain of is the lack of time to ask questions. I literally had two people asking if I had questions while they were packing their stuff and leaving the room...
One thing I was super impressed with was my HR person. Super friendly and helpful throughout.

Interview Questions

  • You observe a sample of measurements coming from a fixed length ruler. If the object is shorter than the ruler you observe the actual measurement. Otherwise you observe the length of the ruler. What would be a good estimator of the ruler length?   2 Answers

Other Interview Reviews for Google

  1. Helpful (1)  

    Quantitative Analyst Interview

    Anonymous Employee in Mountain View, CA
    No Offer
    Positive Experience
    Average Interview

    Application

    I applied online. The process took 1 dayinterviewed at Google (Mountain View, CA) in May 2015.

    Interview

    1 hour phone interview, begin with general introduction, followed by some technique questions, and the last 5 minute is Q and A section. The interviewer was quite patient and nice, gave a lot of hint

    Interview Questions

    • simple statistics, uniform distribution, sample size calculation   Answer Question
  2.  

    Quantitative Analyst Interview

    Anonymous Employee in Mountain View, CA
    No Offer
    Positive Experience
    Average Interview

    Application

    I applied through a recruiter. The process took 3 weeksinterviewed at Google (Mountain View, CA) in April 2015.

    Interview

    The recruiter contacted me by email and then schedule two rounds of phone interview. The questions are not that hard. The interviewer was also very nice and will give you some hints if you didnot answer it correctly. Later on, the recruiter gave me call to discuss the feedbacks from the interviewer.

    Interview Questions

    • Some basic stats questions, like test, pdf, cdf of a distribution.   Answer Question
  3. Helpful (9)  

    Quantitative Analyst Interview

    Anonymous Employee
    No Offer
    Negative Experience
    Difficult Interview

    Application

    I applied online – interviewed at Google.

    Interview

    First, a very helpful recruiter contacted me and asked a few questions about my experience. After a few days, she said I could proceed to the second stage: a technical phone interview.
    I was interviewed by a random engineer from a random department. He asked about my background, and let me solve a probability problem. The question itself was not too hard, but I didn't do it very well (because I hadn't used it for many years).

    Interview Questions

    • A conditional probability (Bayes theorem) problem. About jars and coins.   Answer Question
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  5. Helpful (2)  

    Quantitative Analyst Interview

    Anonymous Employee in Mountain View, CA
    No Offer
    Neutral Experience
    Easy Interview

    Application

    I applied through an employee referral. The process took 1+ weekinterviewed at Google (Mountain View, CA) in February 2015.

    Interview

    Interview involved some statistics(comparing multiple samples to find the error) and some probability questions ( calculating the joined probability of three independent events) plus a coding question in R (related to the probability question).

    Interview Questions

  6.  

    Quantitative Analyst Interview

    Anonymous Interview Candidate
    Accepted Offer
    Positive Experience
    Difficult Interview

    Application

    I applied online. The process took 2 weeksinterviewed at Google.

    Interview

    Hiring process was very smooth, took less than 2 weeks to go through 5 interviews: 1 phone call and 4 on site interviews. Got feedback the same day after all interviews and the offer in less than 2 weeks since the initial interview. Recruiter and interviews were very professional and the interviews were not particularly hard, not the the famous "how many golf balls fit in a bus" type of questions.

    Interview Questions

  7.  

    Quantitative Analyst Interview

    Anonymous Employee in New York, NY
    No Offer
    Positive Experience
    Difficult Interview

    Application

    I applied online. The process took 1+ weekinterviewed at Google (New York, NY) in December 2014.

    Interview

    I was contacted by a recruiter, who sent me a series of questions that I answered in print. After that I was contacted to set up a phone interview. A current quantitative analyst was the interviewer. She went right into the the interview questions and stopped right at 30 minutes. The interview consisted of technical statistical questions, a thought experiment, then time for me to ask questions.

    Interview Questions

    • What do you know about logistical regression?   Answer Question
    • How would you derive a confidence interval from a series of coin tosses?   Answer Question
  8. Helpful (15)  

    Quantitative Analyst Interview

    Anonymous Employee in Mountain View, CA
    No Offer
    Easy Interview

    Application

    I applied online. The process took 4 weeksinterviewed at Google (Mountain View, CA) in October 2014.

    Interview

    So when I saw the Ad online, I just applied and was not sure they would even respond since I know Google receives a lot of applications per day and I always assumed they had a bias for Ivy League schools. But Alas, 2 weeks later I received a call from a recruiter and she asked me a few questions but it did not take her long during that interview before she told me that she was putting me to the next round.

    For the next phone call round, I talked to one of the guys in the team and he asked me a whole bunch of statistical questions and I was able to answer them all correctly. Got a call from the recruiter saying I made it to the round with the Hiring manager, again I had done my homework so I was able to quickly answer her questions and some were really hard statistical questions so I suggest you read the text book to familiarize yourself with statistical because they will ask you the 5 assumptions of logistic regression vs ols. Nailed it and moved on the final in person interview.

    At the onsite interview I was interviewed by 5 people but within minutes I knew I did not stand a chance and I will explain why at the bottom. But firstly the 1st interviewer was nice , answered all questions quickly and correctly. The next interviewer was very cold, never smiled and had a background in PhD in statistics. Asked me a bunch of questions , answered them correctly and then he started asking me very hard mathematics questions which he started calculating on the white board, I didn't get one correctly and at the end of the interview I had to ask him why he was asking such hardcore mathematics questions when the job specifically indicated that it only needed minimal stats background. He said sorry, i just went on a tandem (but since i had missed one of his very hard questions I felt that was not fair). Next came a guy who was more interested in telling me how awesome he was , which country I came from and about his girlfriend (very unprofessional). But talking to this guy I could already see some hints of biases as he asked me which school I had gone to and to name some world renown professors in the department , when he had already told me he did not know my school, which by the way is one of the best public schools , top 10. Then he went on to talk about his professors at the Ivy league he went to etc. Quite unprofessional. The last interviewer was the hiring manager and she too asked very difficult statistical questions but I was able to answer them quickly , they require you to think on your toes. After I finished these interviews I knew I had done extremely well because these were statistical questions and I had answered almost all of them correctly except the hardcore mathematics equation question which had no reason to be in the interview. But as soon as I left I knew that the team would not hire me and he is why?

    How do you stand a chance to be recruited when 4 of the interviewers are males and all 5 interviewers are white and they all have Ivy League backgrounds and although I go to a top 10 public school but still it's not Ivy League. The other 2 guys who made it to the top 3 onsite interviews were also white males from Ivy Leagues. I am sure that interviewer did not tell that he didn't know his school or to name a renown professor in their department. Google needs to change something seriously. I am not saying I didn't stand a chance because of my race or gender but you can tell by the types of questions you get that these interviewers are already biased towards ivy league e.g. One interviewer asking me to name some world renown professors in my department (did not understand the relevance of that to the interview) and then telling me, I don't like D.C (promixty of where the school is) and then proceeding to tell me that they thought my school was rural. Social Science studies predict that most people hire people who look like themselves and somewhat similar backgrounds to them. My recruiter told me that I did very well in the interviews and she herself could not understand why I was not picked but I will leave that to Google. All I am saying is that they should train their interviewers to have less bias towards none ivy league candidates because if you check on linkedin about 90% are ivy league. I got accepted to an Ivy League but could not accept the place because my parents are poor , so the fact that I went to a public school doesn't mean I am not as smart as someone who didn't attend an Ivy League school.

    Interview Questions

    • They were all pretty easy to me and basic statistics questions. OLS vs. Logistic regression, multicollinearity etc   Answer Question
  9. Helpful (3)  

    Quantitative Analyst Interview

    Anonymous Employee in Mountain View, CA
    No Offer
    Positive Experience
    Difficult Interview

    Application

    I applied online. The process took 4+ weeksinterviewed at Google (Mountain View, CA) in September 2014.

    Interview

    Applied online and got contacted by a technical recruiter. I had to fill about 13 questions first - i guess this was a kind of screening process. and she got back to me 2 weeks later saying that I will have a phone interview. In the phone interview, I answered questions but with the interviewer's hints. The recruiter got back to me a week later saying that she's not moving forward with me as they are looking for candidates with stronger problem solving skills.

    Interview Questions

  10.  

    Quantitative Analyst Interview

    Anonymous Employee in Mountain View, CA
    No Offer
    Positive Experience
    Average Interview

    Application

    I applied online. The process took 4+ weeksinterviewed at Google (Mountain View, CA) in April 2014.

    Interview

    Very awesome guys! 45 min per interviewer. They will ask you fundamental knowledge in statistics. You have to be very familiar with textbooks and react very very quickly.

    Interview Questions

    • They go very deep into each question. You should be able to answer the first questions but the later the harder.   Answer Question

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