The Scenario
An e-commerce site ran an A/B test on their checkout button colour. Control (blue) had 1,200 conversions out of 15,000 visitors. Variant (green) had 1,350 conversions out of 15,000 visitors. The product manager is celebrating, but is the difference statistically significant?
The Brief
Conduct a hypothesis test. State your null and alternative hypotheses, choose the right test, calculate the result, and write your recommendation to the product manager.
Deliverables
- The null and alternative hypotheses stated formally
- The statistical test you chose (z-test for proportions, chi-square, etc.) and why
- The test statistic, p-value, and your conclusion at α = 0.05
- A one-paragraph recommendation to the product manager in plain English
Submission Guidance
Show your working. A p-value without the calculation behind it is not convincing. If you would not ship this change, say so and explain why.
Submit Your Work
Your submission is graded against the rubric on the right. If you pass, you get a public Badge URL you can share on LinkedIn. There is no draft save, so work offline first and paste your finished response here.