Encoding Categorical Features

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

Lasso vs Ridge

Job Recommendation

Fractional Shares

Instagram TV Success

Booking Regression

Random Bucketing

Download Facts

Assumptions of Linear Regression

What is the difference between the Z and t tests?

Z and t Tests

Rejection Reason

Why Do We Need Time Series Models?

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

Softmax vs Logistic

Estimating D

Distance Traveled

Let’s say that you're in charge of an e-commerce D2C business that sells socks. What business health metrics would you care?

D2C Socks e-Commerce

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

Detecting Firearm Sales

2nd Highest Salary

Revenue Retention

Swipe Precision

Top Three Salaries

Email Blast

Distribution of 2X - Y

Subscription Overlap

Pre-Launching Shows

Manager Team Sizes

Facebook Stories

Upsell Transactions

Alphabet Sum

Monthly Customer Report

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

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

Over 100 Dollars

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

Decreasing Comments

Find the missing integer from a array of consequtive integers

Find the Missing Number

Empty Neighborhoods

First to Six

Comments Histogram

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

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

Merge Sorted Lists

Customer Orders

Bank Fraud Model

Variable Error

Coefficients of Logistic Regression

Rolling Bank Transactions

First Touch Attribution

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

Employee Salaries (ETL Error)

Perfectly Separable

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

Search Ratings

Keyword Bidding

Type-ahead Search

Using R Squared

Youtube Recommendations

Promoting Instagram

Create and write queries for health metrics for stack overflow 

Community Health Metrics

Amateur Performance

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 

Raining in Seattle

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

Demand Metrics

New Partner Card

Parents Joining Teens

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

Random Number

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

Compute Deviation

Stranded Miner

Paired Products

Closest SAT Scores

Changing Composer

Significance Time Series

Last Transaction

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

Complete Addresses

Button AB Test

Experiment Validity

Threaded Comments

Mouse Search

Greatest Common Denominator

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

Netflix Retention

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

Normal Distribution Sample

AR and MA

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

Random SQL Sample

Cumulative Distribution

Impression Reach

Poker Pair

Find how much overlapping jobs are costing the company

Nightly Job

500 Cards

N Dice

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.

SAP Interview Questions

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