Post Hoc

1
Post Hoc

• Perri Collier
• Myles King

2
Post Hoc

• Event A happened immediately prior to event B.
  Therefore, A caused B.
• Post Hoc also manifests itself as a bias towards
  jumping to conclusions based upon coincidences.
• "Logical Fallacy Post Hoc." Logical Fallacies
• The Fallacy Files. Fallacy Files. Web. n.d.
• 13 Apr. 2011.
• "Post Hoc Ergo Propter Hoc." Cunningham
• Cunningham, Inc. CategoryLogic, 27 Feb.
• 2007. Web. 14 Apr. 2011.

3
Universal Example of Post Hoc

• I had been doing pretty poorly this season. Then
  my girlfriend gave me this neon laces for my
  spikes and I won my next three races. Those laces
  must be good luck...if I keep on wearing them I
  can't help but win!
• "Fallacy Post Hoc." Fallacy Post Hoc. The
  Nizkor Project, 2009. Web. 14 Apr. 2011.

4
Example of Post Hoc in The Crucible

• Giles Last night-mark this-I tried and tried
  and could not say my prayers. And then she closed
  her book and walks out of the house, and
  suddenly-mark this-I could pray again.
• Act 1 Page 186

• This is an example of post hoc because the fact
  that Giless wife was reading a book has nothing
  to due with the fact that he could not say his
  prayers. A more plausible explanation would be
  that maybe Giles just forgot his prayers. It even
  says that sometimes he forgets his prayers in the
  background information given.

5
Example of Post Hoc in The Crucible

• Abigail She sends her spirit on me on church
  she makes me laugh at prayer.
• Act 1 Page 187

• This is an example of post hoc because Tituba
  sending her spirit out on Abigail has nothing to
  do with her laughing at prayer. Abigail is just
  laughing at prayer because she just does not want
  to be there most likely and that is just part of
  her personality.

6
Example of Post Hoc in The Crucible

• Cheever Tis hard proof I find here a poppet
  Goody Procter keeps.
• Act 2 Page 203

• This is an example of post hoc because the fact
  that Elizabeth has a doll in her house does not
  mean that she is guilty and a witch. It also does
  not mean that she has done all the things Abigail
  says she has done.

7
Example of Post Hoc in The Crucible

• Hathorne You would faint, saying their spirits
  came out of their bodies and chocked you-
• Mary Warren That were pretense, sir.
• Act 3 Page 218

• This is an example of post hoc because the fact
  that these girls were fainting has nothing to due
  with the possibility that these people are
  witches. However, the court is using this as
  evidence to convict many people of being witches.