How do I approach Analytics & Experimentation interview questions?

Analytics & Experimentation questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master analytics & experimentation interviews.

What difficulty level is this interview question?

This is a medium difficulty Analytics & Experimentation question, commonly asked during Technical Screen rounds at Roku.

What role is this question designed for?

This question is commonly asked for Data Scientist candidates at Roku during technical interviews.

Analyze Profit Decline: Data Collection and Hypothesis Testing

Last updated: Mar 29, 2026

Quick Overview

This question evaluates analytical diagnostics competencies including data collection, KPI decomposition, funnel and cost-component analysis, and hypothesis-driven testing, and is categorized in Analytics & Experimentation.

Roku

Jul 12, 2025, 6:59 PM

Data Scientist

Technical Screen

Analytics & Experimentation

Coffee Shop Profit Drop Diagnostics

Scenario

You manage a coffee shop and notice profits have declined over a recent period.

Task

Outline a systematic plan to diagnose the profit drop. Be specific about:

The data you would collect (internal and external).
The metrics and decompositions you would calculate.
The hypotheses you would test and how you would test them.
How you would validate findings and propose next steps.

Minimal Context and Assumptions

Focus on 1–2 stores over the last 8–12 weeks, compared to the prior comparable period and year-over-year (to handle seasonality).
Channels may include in-store, mobile order-ahead, and delivery.
Profit = Revenue − COGS − Labor − Operating Costs (rent, utilities, delivery fees, waste, refunds, discounts).

Note: Consider funnel dynamics (traffic → conversion → ticket size), cost changes, seasonality, competition, and external factors.

Solution

Show

Comments (0)

Loading comments...

Browse More Questions

More Analytics & Experimentation•More Roku•More Data Scientist•Roku Data Scientist•Roku Analytics & Experimentation•Data Scientist Analytics & Experimentation