Analyze Change in App Metrics and Feature Impact

Q: Analyze Change in App Metrics and Feature Impact

This question evaluates a data scientist's competency in product analytics, experimentation design, causal inference, metric selection, hypothesis framing across the AARRR funnel, and quantitative impact sizing within the Analytics & Experimentation domain.

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.

Question

Scenario

A consumer app has either launched a new feature or observed a sudden change in a key metric. You are asked to investigate and drive a decision.

Tasks

Frame the problem and outline how you would understand what changed, why it changed, and why the business should care.
Metrics
- Propose north-star, secondary, and guard-rail metrics.
- Specify the granularity you would track and why.
Sizing
- Size the magnitude of the impact or opportunity. State assumptions and show calculations.
Hypothesis
- Formulate hypotheses along the user journey (AARRR: Acquisition, Activation, Retention, Revenue, Referral).
- Specify what data and analyses you would use to validate them.
Experiment design
- Design an A/B test: randomization unit, key metrics, network-effect concerns, sanity checks, sample size calculation, and launch decision criteria.
If an A/B test is infeasible
- Outline suitable quasi-experimental approaches and how you would validate assumptions.

Hint: Think top-down: frame problem → pick metrics → state hypothesis → design experiment or analysis → weigh trade-offs.

Analyze Change in App Metrics and Feature Impact

Scenario

Tasks

Solution

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