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And I would argue it's about 8%.
In fact, as we see, it will come out at 8 1/3%
mathematically.
And the way to see this in this diagram is
this is the region that should test as positive.
By having a positive test, you know you're in this region,
and nothing else matters.
You know you're in this circle.
But within this circle, the ratio of the
cancerous region relative to
the entire region is still pretty small.
It increase, obviously, having a positive test
changes your cancer probability,
but it only increases by a factor of about 8,
as we will see in a second.