Interpret mixed results across segments from an experiment
Last updated: September 13, 2025
Quick Overview
An experiment shows a 3% lift with p=0.08. What conclusions can you draw? What are the caveats?
Apple
September 13, 20258
5
805 solved
An experiment shows a 3% lift with p=0.08. What conclusions can you draw? What are the caveats?
Apple values data-driven decision making. This Onsite question assesses whether you can design experiments, interpret results correctly, and avoid common statistical pitfalls like p-hacking or Simpson's paradox.
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
- How would you explain this result to a non-technical audience?
- How would you handle multiple comparisons?
- What assumptions does this test make, and how would you validate them?
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Problem Formulation
We are tasked with interpreting the results of an experiment conducted by Apple which shows a 3% lift in a certain metric with a p-value of 0.08.
Let us define the null hypothesis : There i...
Solution Approach
To assess the significance of our results, we compare the p-value to a commonly used significance level, .
- Evaluate the p-value: With a p-value of 0.08, we see that ( 0.08...
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