Why can an overall conversion rate improve while conversion falls in every major segment?
Interactive Practice Mode
Formulate your thoughts or take notes before revealing the model solution.
Saved automatically
Model Answer & Deep-Dive Explanation
This can happen when the mix shifts toward segments with higher baseline conversion, an example of Simpson’s paradox. Suppose both mobile and desktop conversion decline, but a larger share of traffic now comes from the historically stronger desktop segment. The weighted overall rate can rise. Inspect denominators, segment rates, and traffic weights for both periods. Use an appropriate standardized comparison or model when needed. Do not infer that the product improved from the aggregate rate without understanding the change in composition.
Related Questions in Data Science & Analytics
How would you design an A/B test for a new signup page?
Medium level • 6 views
What questions should you ask before filling missing values in a dataset?
Easy level • 5 views
Two datasets disagree about active customers. How would you reconcile them?
Medium level • 4 views
How do mean and median behave differently when salaries contain extreme values?
Easy level • 3 views
A dashboard shows revenue rose 20%. What would you check before calling it business growth?
Medium level • 2 views