A new airline came out as the fastest average boarding times compared to other airlines.  What factors could have biased this result and what would you look into?

Boarding Times Bias

Fractional Shares

Create and write queries for health metrics for stack overflow 

Community Health Metrics

Job Recommendation

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

Hundreds of Hypotheses

Lasso vs Ridge

Why Do We Need Time Series Models?

Random Bucketing

Rejection Reason

Instagram TV Success

Booking Regression

Encoding Categorical Features

Assumptions of Linear Regression

Write a function to get a sample from a standard normal distribution.

Normal Distribution Sample

What is the difference between the Z and t tests?

Z and t Tests

What are the logistic and softmax functions? What is the difference between the two?

Softmax vs Logistic

Last Transaction

Write a query to select the top 3 departments with at least ten employees and rank them according to the percentage of their employees making over 100K in salary.

Employee Salaries

How would you build a model to detect if a post on a marketplace is talking about selling a gun?

Detecting Firearm Sales

Subscription Overlap

Top Three Salaries

Distribution of 2X - Y

Email Blast

Write a query to create a metric that can validate and rank the queries by their search result precision.

Search Ratings

Facebook Stories

Manager Team Sizes

Alphabet Sum

Upsell Transactions

Monthly Customer Report

Write a function to return a dataframe containing every transaction with a total value of over $100.

Over 100 Dollars

Write a function friendship_timeline to generate an output that lists the pairs of friends with their corresponding timestamps of the friendship beginning and then the timestamp of the friendship ending. 

Friendship Timeline

2nd Highest Salary

Distance Traveled

Download Facts

Find the missing integer from a array of consequtive integers

Find the Missing Number

First to Six

Comments Histogram

Empty Neighborhoods

Coefficients of Logistic Regression

Keyword Bidding

Type-ahead Search

Using R Squared

New Partner Card

Promoting Instagram

Amateur Performance

How would you identify supply and demand mismatch in a ride sharing market place?

Demand Metrics

Revenue Retention

Youtube Recommendations

Raining in Seattle

How would you find out if an increase in user conversion rates after a new email journey is casual or just part of a wider trend?

Causal Email Journey 

Given that it is raining today and that it rained yesterday, write a function to calculate the probability that it will rain on the nth day after today.

Rain in N Days

Given an integer N, write a function that returns all of the prime numbers up to N

Prime to N

Parents Joining Teens

Pre-Launching Shows

Given a stream of numbers, select a random number from the stream.

Random Number

Impression Reach

Compute Deviation

Stranded Miner

How would you investigate a decline in the average number of comments per user?

Decreasing Comments

Bank Fraud Model

Paired Products

First Touch Attribution

Mouse Search

Given two sorted lists, write a function to merge them into one sorted list.

Merge Sorted Lists

Estimating D

Changing Composer

Customer Orders

Closest SAT Scores

Write a function to select only the rows where the student's favorite color is green or red and their grade is above 90.

Good Grades and Favorite Colors

Threaded Comments

Experiment Validity

Netflix Retention

Button AB Test

Variable Error

Significance Time Series

Rolling Bank Transactions

Write a query to get the current salary for each employee after an ETL error.

Employee Salaries (ETL Error)

Perfectly Separable

Greatest Common Denominator

Find how much overlapping jobs are costing the company

Nightly Job

Poker Pair

Write a query to randomly sample a row from a big table.

Random SQL Sample

Write a function to create a single dataframe with complete addresses in the format of street, city, state, zip code.

Complete Addresses

Cumulative Distribution

Write a SQL query to find the average number of right swipes for different ranking algorithms.

Swipe Precision

500 Cards

Design a data warehouse for a new online retailer

Retailer Data Warehouse

Find the average yearly purchases for each product

Average Quantity

Three Zebras

Given a list of integers, find the index at which the sum of the left half of the list is equal to the right half.

Cloudflare, Inc. Interview Questions

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