YouTube's built-in thumbnail test is a real tool, but misreading it is easier than using it well. This course teaches how to set up a properly powered test, the sample-size threshold before you call it, the seasonality trap (don't test in launch week), and the post-test decision ritual.
What you'll learn
Setting up a properly powered thumbnail test
Sample-size thresholds before you call the winner
Seasonality traps: why launching week is the worst time to test
The post-test decision ritual: commit, reset, or run again
When to test title alone vs. thumbnail alone vs. both
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