Experiment Validity

Instagram TV Success

Fractional Shares

Create and write queries for health metrics for stack overflow 

Community Health Metrics

Netflix Retention

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

Hundreds of Hypotheses

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

Booking Regression

Encoding Categorical Features

Significance Time Series

Assumptions of Linear Regression

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

Normal Distribution Sample

Download Facts

Promoting Instagram

How do we give each rejected applicant a reason why they got rejected?

Rejection Reason

Why Do We Need Time Series Models?

Lasso vs Ridge

Coefficients of Logistic Regression

Job Recommendation

Paired Products

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

Detecting Firearm Sales

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

Softmax vs Logistic

Write a SQL query to create a histogram of the number of comments per user in the month of January 2020.

Comments Histogram

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

Complete Addresses

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 

Facebook Stories

Distribution of 2X - Y

Empty Neighborhoods

Amateur Performance

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

Over 100 Dollars

Mouse Search

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

Find how much overlapping jobs are costing the company

Nightly Job

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

Customer Orders

Find the missing integer from a array of consequtive integers

Find the Missing Number

Select the 2nd highest salary in the engineering department

2nd Highest Salary

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

Search Ratings

Youtube Recommendations

Keyword Bidding

Bank Fraud Model

Cumulative Distribution

Using R Squared

Revenue Retention

New Partner Card

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

Demand Metrics

This problem involves finding the first non-repeating character in a given string. The solution involves iterating over the string and keeping track of the frequency of each character. The first character that has a frequency of 1 is the first non-repeating character.

Find the First Non-Repeating Character in a String

Email Blast

Pre-Launching Shows

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

Prime to N

Greatest Common Denominator

Compute Deviation

What is the difference between the Z and t tests?

Z and t Tests

Estimating D

Subscription Overlap

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

Get the top 3 highest employee salaries by department

Top Three Salaries

Closest SAT Scores

Monthly Customer Report

Last Transaction

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

Decreasing Comments

Button AB Test

Changing Composer

Alphabet Sum

Manager Team Sizes

First to Six

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

Employee Salaries (ETL Error)

Random Bucketing

Rolling Bank Transactions

Variable Error

Say you are given a dataset of perfectly linearly separable data. What would happen when you run logistic regression?

Perfectly Separable

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

Random SQL Sample

First Touch Attribution

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

Merge Sorted Lists

Impression Reach

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

Random Number

Threaded Comments

Poker Pair

Type-ahead Search

Distance Traveled

Write a query to get the number of customers that were upsold

Upsell Transactions

Parents Joining Teens

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

Stranded Miner

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

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.

Equivalent Index

Flipping 576 Times

Twenty Variants

Food Delivery Times

Missing Housing Data

Unbiased Estimator

Post Composer Drop

Reconstruct the path of a trip so that the trip tickets are in order.

Scrambled Tickets

Group Success

Determine whether there exists a permutation of an input string that is a palindrome.

Permutation Palindrome

Is this feature actually causing people to be unhappy with the app?

Ge Aviation Interview Questions

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