Define goals and success metrics for subscriber-only features

Q: Define goals and success metrics for subscriber-only features

This question evaluates a data scientist's competency in product analytics and experimentation, specifically goal selection, success metric definition, ROI calculation, cannibalization analysis, and end-to-end experiment and instrumentation design for subscriber-only features.

Q: 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.

Q: What difficulty level is this interview question?

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

Q: What role is this question designed for?

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

Question

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Case: Picking the Goal and Measuring Subscriber-Only Benefits (12-week plan, ROI, and cannibalization)

You are the data lead for a subscription-based product. The team plans to add subscriber-only benefits, but leadership has not specified the business goal. Use the baselines and assumptions below.

Baselines/assumptions:

10M MAU total; 1M subscribers, 9M non-subscribers.
Monthly subscriber churn c = 4% (retention R = 96%).
Non‑subscriber → subscriber conversion = 1% per month.
Subscriber ARPU = $12/mo subscription +$ 3/mo ancillary = $15/mo.
Non‑subscriber ad ARPU = $1.20/mo.
Marginal cost per subscriber = $0.50/mo.
Fixed build cost = $1.5M (one-time); maintenance =$ 50k/mo.

Tasks:

Choose and justify one primary goal (retention vs acquisition vs revenue) and the trade-offs.
Define precise success and guardrail metrics with formulas and concrete 12‑week targets.
Design the measurement plan: experiment unit, randomization, segments, horizon, power/MDE, handling trials/upgrades, instrumentation, and abuse guardrails.
Quantify cannibalization of non‑subscriber ad revenue and spillovers to other SKUs, and show how that affects the goal choice.
Provide a back‑of‑envelope ROI threshold: the minimum lift in (a) monthly subscriber retention or (b) non‑subscriber→subscriber conversion that pays back within 12 months.

Define goals and success metrics for subscriber-only features

Quick Overview

Case: Picking the Goal and Measuring Subscriber-Only Benefits (12-week plan, ROI, and cannibalization)

Solution

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