#2545: Bayes' Theorem explain

[Miss Lenhart is pointing with a pointer, held in her right hand, to a white-board with tables, what looks like formulae and lots of other unreadable text. She looks toward her off-panel class, from where a voice replies to her question.]

Miss Lenhart: Given these prevalences, is it likely that the test result is a false positive?

Off-panel voice: Well, this chapter is on Bayes’ Theorem, so yes.

[Caption below the panel]:

Sometimes, if you understand Bayes’ Theorem well enough, you don’t need it.