Interpret no significant difference from an experiment
Last updated: April 28, 2026
Quick Overview
An experiment shows a 3% lift with p=0.08. What conclusions can you draw? What are the caveats?
TikTok
April 28, 20264
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4,250 solved
An experiment shows a 3% lift with p=0.08. What conclusions can you draw? What are the caveats?
Statistics questions at TikTok test your ability to reason quantitatively and design rigorous experiments. This Phone Screen question evaluates your understanding of statistical inference and its application to business decisions.
What the Interviewer Expects
- State the correct formula or theorem with clear definitions
- Apply the concept to the given scenario step by step
- Interpret the result in plain language
- Identify assumptions and when they might be violated
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?
- What assumptions does this test make, and how would you validate them?
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Problem Formulation
In this experiment, we want to evaluate whether a 3% lift in a certain metric (e.g., user engagement) is statistically significant. We set up our hypotheses as follows:
- Null Hypothesis (H0): There ...
Solution Approach
To analyze the results:
- Assess the p-value: Since p = 0.08 > 0.05, we fail to reject the null hypothesis.
- Calculate confidence interval: A confidence interval for the lift can provide ad...
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