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 question evaluates a candidate's understanding of core statistical concepts including probability distributions, confidence intervals, hypothesis testing, the Central Limit Theorem, and interpretation of p-values.