Interpret no significant difference from an experiment
Last updated: November 7, 2025
Quick Overview
An experiment shows a 3% lift with p=0.08. What conclusions can you draw? What are the caveats?
Waymo
November 7, 202511
12
3,761 solved
An experiment shows a 3% lift with p=0.08. What conclusions can you draw? What are the caveats?
Statistics questions at Waymo test your ability to reason quantitatively and design rigorous experiments. This Take-home Project 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
- How would you design a follow-up experiment based on these results?
- What if the sample size is very small?
- How would you handle multiple comparisons?
- How would you explain this result to a non-technical audience?
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Problem Formulation
In this experiment, we are testing whether a new feature implemented by Waymo has a significant impact on user engagement. We define the null hypothesis (H0) as 'the new feature does not lead to any c...
Solution Approach
- Hypothesis Testing: We start with the null hypothesis (H0) of no difference and the alternative hypothesis (H1) of a 3% lift.
- Determine Significance Level: Commonly, a significance lev...
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