##### Scenario Roblox plans to replace an existing homepage tab with a new one and needs to measure the business impact of this change. ##### Question If Roblox replaces an existing homepage tab with a new one, how would you evaluate its impact? Which primary and guardrail metrics would you track, and what hypotheses would you state? Design an experiment or analysis plan outlining sample size, duration, segmentation, and success criteria. ##### Hints Think engagement funnel (CTR, session length, retention), controlled A/B test design, power analysis, guardrails, and potential confounders.

This question evaluates a data scientist's skills in experimental design, causal inference, metric selection (primary outcomes and guardrails), power analysis, segmentation, and confounder mitigation within product analytics.

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 Roblox.

What role is this question designed for?

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

Evaluate Impact of New Roblox Homepage Tab

Measuring the Impact of Replacing a Homepage Tab

Scenario

Roblox plans to replace an existing homepage tab with a new one across eligible users. The goal is to understand whether the new tab improves user engagement and downstream outcomes without harming core health metrics.

Task

Design an evaluation plan that includes:

Hypotheses
Primary outcome metrics and guardrail (safety) metrics
Experiment design (unit of randomization, allocation, instrumentation)
Sample size, duration, and ramp plan
Segmentation
Success criteria and decision rules
Confounders and how you will mitigate them

Hints: Consider the engagement funnel (CTR → launches → playtime → retention), power analysis, guardrails, and potential confounders.

Measuring the Impact of Replacing a Homepage Tab

Scenario

Task

Design an evaluation plan that includes:

Hypotheses
Primary outcome metrics and guardrail (safety) metrics
Experiment design (unit of randomization, allocation, instrumentation)
Sample size, duration, and ramp plan
Segmentation
Success criteria and decision rules
Confounders and how you will mitigate them

Hints: Consider the engagement funnel (CTR → launches → playtime → retention), power analysis, guardrails, and potential confounders.

Evaluate Impact of New Roblox Homepage Tab

Quick Overview

Measuring the Impact of Replacing a Homepage Tab

Scenario

Task

Solution

Submit Your Answer

Evaluate Impact of New Roblox Homepage Tab

Quick Overview

Measuring the Impact of Replacing a Homepage Tab

Scenario

Task

Solution

Submit Your Answer