Analyze your favorite app and improve it

Choose a consumer app you like. a) Describe how it makes money and identify its two main competitors, along with the key ways they differ. b) Acting as CEO, specify three north-star metrics and five guardrail metrics, including exact formulas and the events that qualify. c) Suggest one product change paired with a falsifiable hypothesis; lay out the experiment (randomization unit, invariant checks, minimum detectable effect, power, sample size, test duration, novelty-effect mitigation, and seasonality controls) and explain how you would decide whether to launch. Overview: This prompt tests a data scientist's skills in product analytics, monetization analysis, competitive positioning, metric definition (north-star and guardrails), and experiment design, including power and validity. Read the full interview account where this question appeared.