| Joint Probability Example |
| ØToothache |
| Toothache |
| Cavity |
| 0.04 |
| 0.06 |
| ØCavity |
| 0.01 |
| 0.89 |
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| • | What's
the probability of having a cavity given the |
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| evidence
of a toothache? |
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| • | Like
a lookup table for probabilities: can easily |
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| have
too many entries for practical entry Þ |
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| motivation
for conditional probabilities |
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