Calculate variance for user retention
Last updated: January 30, 2026
Quick Overview
Given the following scenario about user conversion, calculate the the p-value.
Netflix
January 30, 20261
4
139 solved
Given the following scenario about user conversion, calculate the the p-value.
Statistics questions at Netflix test your ability to reason quantitatively and design rigorous experiments. This Technical Screen question evaluates your understanding of statistical inference and its application to business decisions.
What the Interviewer Expects
- Set up the problem formally with proper notation
- Apply the correct statistical test with clear justification
- Interpret results with appropriate caveats and confidence levels
- Discuss practical significance vs statistical significance
- Identify potential confounders and how to address them
Key Topics to Cover
How to Approach This
- Define your hypotheses (H0 and H1) clearly before performing any test.
- Calculate required sample size BEFORE running an experiment, using power analysis.
- Remember the Central Limit Theorem: sample means become approximately normal with large n.
- Watch for Simpson's paradox. Always segment data by key dimensions.
- Distinguish between statistical significance and practical significance.
Possible Follow-up Questions
- What alternative statistical method could you use here?
- How would you handle multiple comparisons?
- How would you design a follow-up experiment based on these results?
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Browse Statistics QuestionsSample Answer
Problem Formulation
To analyze user retention at Netflix, we define our null hypothesis (H0) as 'There is no difference in user retention rates between two groups (A and B)'. Our alternative hypothesis (H1) is 'There is ...
Solution Approach
To calculate the p-value, we will follow these steps:
- Collect Data: Assume we have the following user retention data:
- Group A: [0.90, 0.85, 0.88, 0.92, 0.87]
- Group B: [0.80, 0.82, 0.7...
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