Data science analyst Interview Questions

business sense: There are two types of cars A and B. The number of people in US who use A and B are the same. They drive the same distances each month. Now there are two new technologies, X and Y (of equal cost). If apply X, mpg of A would increase from 50 mpg to 75 mpg; If apply Y, mpg of B would increase from 10 mpg to 11 mpg. The goal is to decrease the dependence on foreign oil, or to decrease the consumption of gasoline. Question: which technology would you apply? Follow up question: after applying the technology of your choice, assume there's money available for research on new technology, which car would you choose to conduct research on?

Data Scientist

Interviewed at Meta

3.6★

Jan 7, 2015

business sense: There are two types of cars A and B. The number of people in US who use A and B are the same. They drive the same distances each month. Now there are two new technologies, X and Y (of equal cost). If apply X, mpg of A would increase from 50 mpg to 75 mpg; If apply Y, mpg of B would increase from 10 mpg to 11 mpg. The goal is to decrease the dependence on foreign oil, or to decrease the consumption of gasoline. Question: which technology would you apply? Follow up question: after applying the technology of your choice, assume there's money available for research on new technology, which car would you choose to conduct research on?

Given a random generator that produces a number 1 to 5 uniformly, write a function that produces a number from 1 to 7 uniformly or something like that.

Data Scientist

Interviewed at LinkedIn

3.8★

Mar 19, 2018

Given a random generator that produces a number 1 to 5 uniformly, write a function that produces a number from 1 to 7 uniformly or something like that.

16p + 1 = x^3, and p is a prime number. What is x?

Data Scientist - Low Latency

Interviewed at Citadel

4★

Nov 4, 2016

16p + 1 = x^3, and p is a prime number. What is x?

SQL part1 Question # 1 : you have the following table - User_id , action (post, edit, cancel) , date == > what is the post rate Question # 2 : you have also the following table (active users) - User_id , country , active , date == > What is the average post rate for yesterday for all active users by country

Data Scientist

Interviewed at Meta

3.6★

Aug 7, 2019

SQL part1 Question # 1 : you have the following table - User_id , action (post, edit, cancel) , date == > what is the post rate Question # 2 : you have also the following table (active users) - User_id , country , active , date == > What is the average post rate for yesterday for all active users by country

How can you tell if a given coin is biased?

Data Scientist

Interviewed at Google

4.4★

Mar 5, 2018

How can you tell if a given coin is biased?

Lets say the population on Facebook clicks ads with a click-through-rate of P. We select a sample of size N and examine the sample's conversion rate, denoted by hat{P}, what is the minimum sample size N such that Probability( ABS(hat{P} - P) < DELTA ) = 95%. In other words (this is my translation), find the minimum sample size N such that our sample estimate hat{P} is within DELTA of the true click through rate P, with 95% confidence.

Data Scientist, Analytics

Interviewed at Meta

3.6★

Mar 6, 2015

Lets say the population on Facebook clicks ads with a click-through-rate of P. We select a sample of size N and examine the sample's conversion rate, denoted by hat{P}, what is the minimum sample size N such that Probability( ABS(hat{P} - P) < DELTA ) = 95%. In other words (this is my translation), find the minimum sample size N such that our sample estimate hat{P} is within DELTA of the true click through rate P, with 95% confidence.

Given 25 swimmers and a pool with five lanes, what is the minimum number of heats needed to determine the three fastest swimmers in the group?

Data Scientist

Interviewed at CKM Analytix

2.9★

Nov 13, 2014

Given 25 swimmers and a pool with five lanes, what is the minimum number of heats needed to determine the three fastest swimmers in the group?

Pick up a coin C1 given C1+C2 with probability of trials p(h1)=.7, p(h2)=.6 and doing 10 trials. And what is the probability that the given coin you picked is C1 given you have 7 heads and 3 tails?

Data Scientist

Interviewed at Meta

3.6★

Feb 25, 2015

Pick up a coin C1 given C1+C2 with probability of trials p(h1)=.7, p(h2)=.6 and doing 10 trials. And what is the probability that the given coin you picked is C1 given you have 7 heads and 3 tails?

Given two binary strings, write a function that adds them. You are not allowed to use any built in string to int conversions or parsing tools. E.g. Given "100" and "111" you should return "1011". What is the time and space complexity of your algorithm?

Data Scientist, Analytics

Interviewed at Meta

3.6★

Mar 6, 2015

Given two binary strings, write a function that adds them. You are not allowed to use any built in string to int conversions or parsing tools. E.g. Given "100" and "111" you should return "1011". What is the time and space complexity of your algorithm?

We have a table called ad_accounts(account_id, date, status). Status can be active/closed/fraud. A) what percent of active accounts are fraud? B) How many accounts became fraud today for the first time? C) What would be the financial impact of letting fraud accounts become active (how would you approach this question)?

Data Scientist, Analytics

Interviewed at Meta

3.6★

Mar 6, 2019

We have a table called ad_accounts(account_id, date, status). Status can be active/closed/fraud. A) what percent of active accounts are fraud? B) How many accounts became fraud today for the first time? C) What would be the financial impact of letting fraud accounts become active (how would you approach this question)?

Data Science Analyst Interview Questions

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