Answer Statistics Questions for Spokeo DS Role Quiz

Quick Overview

This interview question evaluates statistical assumptions, formulas, estimation strategy, uncertainty, edge cases, and interpretation in a realistic interview setting. A strong answer for Answer Statistics Questions for Spokeo DS Role Quiz states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

Answer Statistics Questions for Spokeo DS Role Quiz

Company: Spokeo

Role: Data Scientist

Category: Statistics & Math

Difficulty: medium

Interview Round: Onsite

##### Scenario Online HackerRank first round for Spokeo DS role – timed statistics quiz ##### Question What are the expectation and variance of a Poisson(λ) distribution? 2) Given sample size n and population standard deviation σ, write the 95% confidence interval for the population mean. 3) When should a two-sample t-test be used instead of a z-test? 4) State the Central Limit Theorem and one practical implication of it. 5) Interpret a p-value of 0.03 in the context of hypothesis testing. ##### Hints Focus on core formulas, distribution properties, and correct interpretation of statistical tests.

Quick Answer: This interview question evaluates statistical assumptions, formulas, estimation strategy, uncertainty, edge cases, and interpretation in a realistic interview setting. A strong answer for Answer Statistics Questions for Spokeo DS Role Quiz states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

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Answer Statistics Questions for Spokeo DS Role Quiz

Timed Statistics Quiz: Short-Answer Concepts

Answer the following independent questions succinctly. Assume standard statistical definitions and that symbols have their usual meanings.

  1. What are the expectation and variance of a Poisson(λ) distribution?
  2. Given sample size n and known population standard deviation σ, write the 95% confidence interval for the population mean.
  3. When should a two-sample t-test be used instead of a z-test?
  4. State the Central Limit Theorem (CLT) and give one practical implication.
  5. Interpret a p-value of 0.03 in the context of hypothesis testing.

Constraints & Assumptions

  • Preserve the scope, facts, inputs, and requested outputs from the prompt above.
  • If the prompt leaves a detail unspecified, state a reasonable assumption before relying on it.
  • Keep the answer interview-ready: concise enough to present, but concrete enough to implement or evaluate.

Clarifying Questions to Ask Guidance

  • Clarify the random variables, distributional assumptions, independence assumptions, and desired output.
  • Show enough derivation for the interviewer to follow the reasoning.
  • Explain how you would validate the result with simulation or sensitivity checks.

What a Strong Answer Covers Guidance

  • A correct setup with definitions, formulas, and boundary conditions.
  • A step-by-step derivation or estimation plan.
  • Interpretation of the result, including uncertainty and practical limitations.
  • Checks for assumptions, edge cases, and numerical stability.

Follow-up Questions Guidance

  • How would the result change if the assumptions were relaxed?
  • Can you verify the answer with a simulation?
  • What is the most likely source of estimation error?
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