Calculate expected value for A/B test results
Last updated: January 25, 2026
Quick Overview
Given the following scenario about user conversion, calculate the the p-value.
Zoom
January 25, 202623
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1,189 solved
Given the following scenario about user conversion, calculate the the p-value.
Analytics questions at Zoom evaluate your ability to define metrics, design experiments, and derive actionable insights from data. This Phone Screen question tests your end-to-end analytical thinking.
What the Interviewer Expects
- Design a rigorous experiment with proper randomization and sample size calculation
- Define primary and guardrail metrics with clear rationale
- Address novelty effects, network effects, and interference
- Segment results appropriately and identify heterogeneous treatment effects
- Propose follow-up analyses when results are ambiguous
Key Topics to Cover
How to Approach This
- Define success metrics carefully. A good metric is measurable, actionable, and aligned with business goals.
- Run experiments long enough to account for novelty effects and weekly seasonality.
- Use funnel analysis to identify where users drop off for maximum optimization impact.
- Segment results by key dimensions (platform, country, user cohort) to catch hidden patterns.
- Consider network effects and interference between treatment and control groups.
Possible Follow-up Questions
- How would you handle an experiment where the control and treatment groups are different sizes?
- What would you do if a stakeholder wants to end the experiment early because initial results look good?
- How would you handle interference between treatment and control?
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Problem Setup
To calculate the expected value for A/B test results at Zoom, we need to frame our analytical question: "What is the impact of the new feature on user conversion rates?" We should collect data on the ...
Methodology
For this analysis, we will use a two-proportion z-test to determine whether the difference in conversion rates between the control and treatment groups is statistically significant. The formula for th...
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