Bayes' Theorem
---------------

This page is inpired from `MathIsFun <https://www.mathsisfun.com/data/bayes-theorem.html>`__.

Theorem
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See the `3Blue1Brown video <https://www.youtube.com/watch?v=HZGCoVF3YvM>`__ for a better understanding.

Example
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Hunter says she is itchy. There is a test for Allergy to Cats, but this test is not always right:
For people that really do have the allergy, the test says "Yes" 80% of the time
For people that do not have the allergy, the test says "Yes" 10% of the time ("false positive")
If 1% of the population have the allergy, and Hunter's test says "Yes", what are the chances that Hunter really has the allergy?