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Metricsstretch
Average session length on YouTube went up, but daily active users went down. What's happening?
How to approach it
This might be a mix shift. If light users left, the average rises even when nobody watches more.
How a strong answer opens
“My first hypothesis is a mix shift. If light users stopped coming, average session length rises even if nobody watches more, so I'd check total watch time first.”
Outline of a strong answer
Try answering out loud for a few minutes before you open this.
- Check that both numbers are calculated the same way as before
- Test the mix-shift idea: did light users drop off?
- Segment by user type, device, country
- Look for causes that push away light users (login wall, slower start)
- Check the total watch time to see if overall value grew or shrank
- Recommend the next analysis and a fix
Where this question usually goes wrong
Celebrating longer sessions as an engagement win without noticing the average rose because short-session users left.
Learn the method
Diagnosing a metric drop in Module 2, Metrics and execution.
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