Find the missing integer from a array of consequtive integers

Find the Missing Number

Bank Fraud Model

Variable Error

Using R Squared

Booking Regression

Fractional Shares

What is the difference between the Z and t tests?

Z and t-Tests

Subscription Overlap

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

Hundreds of Hypotheses

Experiment Validity

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

Random SQL Sample

How do we go about selecting the best 10,000 customers for the pre-launch?

Pre-Launching Shows

Random Bucketing

Promoting Instagram

Instagram TV Success

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

Perfectly Separable

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

Rejection Reason

Monthly Customer Report

Job Recommendation

First Touch Attribution

Compute Deviation

Distribution of 2X - Y

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

Changing Composer

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

Facebook Stories

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

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

Upsell Transactions

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

Decreasing Comments

Coefficients of Logistic Regression

Closest SAT Scores

Get the top 3 highest employee salaries by department

Top Three Salaries

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

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

Merge Sorted Lists

Download Facts

Rolling Bank Transactions

Encoding Categorical Features

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

Normal Distribution Sample

Assumptions of Linear Regression

Estimating D

Netflix Retention

Youtube Recommendations

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

Softmax vs Logistic

Impression Reach

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

Complete Addresses

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

Greatest Common Denominator

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

Over 100 Dollars

Alphabet Sum

New Partner Card

Amateur Performance

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

Demand Metrics

Revenue Retention

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

Detecting Firearm Sales

Stranded Miner

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

Prime to N

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

Random Number

We’re nearing the end of the quarter and are missing revenue expectations by 10%. An executive asks the email marketing person to send out a huge email blast to your entire customer list asking them to buy more products.  Is this a good idea? Why or why not?

Email Blast

Find how much overlapping jobs are costing the company

Nightly Job

Mouse Search

Manager Team Sizes

Write a query that returns all neighborhoods that have 0 users.

Empty Neighborhoods

Why Do We Need Time Series Models?

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

Employee Salaries (ETL Error)

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

Comments Histogram

Customer Orders

Last Transaction

Lasso vs Ridge

Select the 2nd highest salary in the engineering department

2nd Highest Salary

Raining in Seattle

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

Paired Products

First to Six

Threaded Comments

Cumulative Distribution

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

Search Ratings

Keyword Bidding

Poker Pair

Significance Time Series

Create and write queries for health metrics for stack overflow 

Community Health Metrics

Parents Joining Teens

Button AB Test

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

Swipe Precision

Type-ahead Search

Distance Traveled

Payments Received

Find Bigrams

Missing Housing Data

Post Composer Drop

Group Success

Determine the cause of the drop in capital approval rates.

Approval Drop

AB Test Ties

85% vs 82%

Declining Applicants

Network Experiment Design

Find the difference between users' first and last sessions in the year

Session Difference

Find out the number of users that gave a like on a certain date

Like Tracker

Emails Opened

What statistical test could you use to determine which of two parcel types is better to use, given how often they are damaged?

Relx Interview Questions

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