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Homebase Interview Questions

homebase is a leading home enhancement retailer and offers a growing range of home improvement products in a differentiated store environment. it sells products across a broad range of categories and offers installation services alongside more traditional diy items, and also has a growing internet offering at www.homebase.co.uk.

homebase is a leading home enhancement retailer and offers a growing range of home improvement products in a differentiated store environment. it sells products across a broad range of categories and offers installation services alongside more traditional diy items, and also has a growing internet offering at www.homebase.co.uk.

Overview

A/B Testing

Algorithms

Analytics

Machine Learning

Probability

Product Metrics

Python

Statistics

Homebase Interview Guides

Suppose there exists a new airline named Jetco that flies domestically across North America. Jetco recently had a study commissioned that tested the boarding time of every airline, and it came out that Jetco had the fastest average boarding times of any airline.

What factors could have biased this result, and what would you look into?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

Boarding Times Bias

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?

Let’s say that your company is running a standard control and variant AB test on a feature to increase conversion rates on the landing page. The PM checks the results and finds a .04 p-value.

How would you assess the validity of the result?

Experiment Validity

A/B Testing & Experimentation

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

What is a key disadvantage of the F-test when compared to multiple t-tests?

What is a key disadvantage of the F-test when compared to multiple t-tests?

Hundreds of Hypotheses

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

Question	Topic	Difficulty	Ask Chance
Boarding Times Bias	Statistics	Medium	Very High
Experiment Validity	A/B Testing & Experimentation	Medium	Very High
Hundreds of Hypotheses	Statistics	Medium	Very High