8.4 Order in Conditional Probabilities
If we know a viewer sees ads, then what is the probability that the viewer is using YouTube? That’s an interesting question because the answer describes those who see ads. Among those who watch ads, which app is most common? Marginally, Spotify is the largest draw; it pulls in one-half of the audience. Does it also provide the largest audience for ads?
The tree we built is not organized to answer this question easily. Trees work well if the question we need to answer matches the direction of the tree; this one does not. The tree shows us conditional probabilities such as P(See ads|Spotify). It’s not so easy to find P(Spotify|See ads). Those who watch ads are scattered among the branches.
This task is easier ...
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