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A/B Testing in Plain English
by eBay Product Manager
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A/B Testing in Plain English
Nicole Lau
September 2020
Agenda
My Background
What Is A/B Testing, and Why Should You A/B Test?
Case Study
- Concepts
- Best Practices
- Common Pitfalls
Resources
My Background
Journey to eBay Product Manager,
Experimentation
Before eBay
- Venture Capital Analyst-turned Program Manager
- Business Development at startups and mid size companies
At eBay
- Experimentation Services to internal teams (i.e. E2E consultation)
- Program Management (i.e. education, best practices)
What Is A/B Testing?
Why Should You A/B test?
What is A/B testing?
To see which variation performs better
Why Should You A/B test?
Experimentation drives product innovations
Industry Examples
Case Study
Scenario: You are eBay Homepage Product Manager
End-to-end Flow
A sufficient
backblog of
quality testing
ideas
Hypothesis,
success metrics,
launch decision
framework
Configure,
smoke test,
ensure correct
tracking in place
Collect data Statistical
significance and
power
Gather insights
from both
successes and
failures
1. Ideate
Build sufficient backlog of quality ideas + Strategic Prioritization
2. Design
Hypothesis IF (improve headline wordings),
THEN (users are more likely to click on CTA button).
Success Metrics Primary- CTR on CTA button
Secondary- Homepage bounce rate, module engagement
Guardrail- Bought items, Revenue
Launch decision framework
3. Set up
Correct user experience
Correct tracking
Free of data quality issues
Version A (Control)
Version B (variation)
4. Run
Reach minimum sample size needed
No mid-test changes to avoid attribution issues
https://unbounce.com/ab-test-duration-calculator/
Regression to the mean
5. Analyze
Ship, iterate, or abandon?
95% Statistical Significance
80% Statistical Power
Confidence Level
Impressions Clicks CTR Improvement p-value Min.
sample
reached?
Version A
(Control)
120,000 12,000 10% +5%
(+/- 0.5)
0.03 Yes
Version B
(Variation)
120,000 18,000 15%
6. Learn
Learn from both successes and failures
Uncover segment-specific insights and
discoveries for future iterations of ideas
Resources
Resources
Blogs
- CXL (courses, webinars, and blogs on conversion optimization, ecommerce best practices, A/B testing guide)
- VWO (“Knowledge Base” articles on A/B testing concepts)
- Optimizely (“Knowledge Base” articles on A/B testing concepts)
- Medium #experimentation
Books
- Trustworthy Online Controlled Experiments: A Practical Guide to A/B Testing by Ron Kohavi, Diane Tang, Ya Xu
- Experimentation Works: The Surprising Power of Business Experiments by Stefan Thomke
My Contact
Email: wylau.nicole@gmail.com
LinkedIn: https://www.linkedin.com/in/nicole-lau-01414517/
www.productschool.com
Part-time Product Management Training Courses
and
Corporate Training

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A/B Testing in Plain English by eBay Product Manager

  • 1. www.productschool.com A/B Testing in Plain English by eBay Product Manager
  • 2. CERTIFICATES Your Product Management Certificate Path Product Leadership Certificate™ Full Stack Product Management Certificate™ Product Management Certificate™ 20 HOURS 40 HOURS 40 HOURS
  • 3. Corporate Training Level up your team’s Product Management skills
  • 4. Free Product Management Resources BOOKS EVENTS JOB PORTAL COMMUNITIES bit.ly/product_resources COURSES
  • 5. A/B Testing in Plain English Nicole Lau September 2020
  • 6. Agenda My Background What Is A/B Testing, and Why Should You A/B Test? Case Study - Concepts - Best Practices - Common Pitfalls Resources
  • 8. Journey to eBay Product Manager, Experimentation Before eBay - Venture Capital Analyst-turned Program Manager - Business Development at startups and mid size companies At eBay - Experimentation Services to internal teams (i.e. E2E consultation) - Program Management (i.e. education, best practices)
  • 9. What Is A/B Testing? Why Should You A/B test?
  • 10. What is A/B testing? To see which variation performs better
  • 11. Why Should You A/B test? Experimentation drives product innovations
  • 14. Scenario: You are eBay Homepage Product Manager
  • 15. End-to-end Flow A sufficient backblog of quality testing ideas Hypothesis, success metrics, launch decision framework Configure, smoke test, ensure correct tracking in place Collect data Statistical significance and power Gather insights from both successes and failures
  • 16. 1. Ideate Build sufficient backlog of quality ideas + Strategic Prioritization
  • 17. 2. Design Hypothesis IF (improve headline wordings), THEN (users are more likely to click on CTA button). Success Metrics Primary- CTR on CTA button Secondary- Homepage bounce rate, module engagement Guardrail- Bought items, Revenue Launch decision framework
  • 18. 3. Set up Correct user experience Correct tracking Free of data quality issues Version A (Control) Version B (variation)
  • 19. 4. Run Reach minimum sample size needed No mid-test changes to avoid attribution issues https://unbounce.com/ab-test-duration-calculator/ Regression to the mean
  • 20. 5. Analyze Ship, iterate, or abandon? 95% Statistical Significance 80% Statistical Power Confidence Level Impressions Clicks CTR Improvement p-value Min. sample reached? Version A (Control) 120,000 12,000 10% +5% (+/- 0.5) 0.03 Yes Version B (Variation) 120,000 18,000 15%
  • 21. 6. Learn Learn from both successes and failures Uncover segment-specific insights and discoveries for future iterations of ideas
  • 23. Resources Blogs - CXL (courses, webinars, and blogs on conversion optimization, ecommerce best practices, A/B testing guide) - VWO (“Knowledge Base” articles on A/B testing concepts) - Optimizely (“Knowledge Base” articles on A/B testing concepts) - Medium #experimentation Books - Trustworthy Online Controlled Experiments: A Practical Guide to A/B Testing by Ron Kohavi, Diane Tang, Ya Xu - Experimentation Works: The Surprising Power of Business Experiments by Stefan Thomke
  • 24. My Contact Email: wylau.nicole@gmail.com LinkedIn: https://www.linkedin.com/in/nicole-lau-01414517/
  • 25. www.productschool.com Part-time Product Management Training Courses and Corporate Training