# Logical Fallacies - PowerPoint PPT Presentation

Logical Fallacies

1 / 12
Logical Fallacies

## Logical Fallacies

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
##### Presentation Transcript

1. Logical Fallacies 8th grade ELA

2. What is a logical fallacy? Definition: a mistake in reasoning. Used when trying to make an argument and the use of bad logic makes the point invalid QUESTION: Which of the following is a logical fallacy? • All men are mortal; Mr. Morgan is a man; therefore, Mr. Morgan is a mortal • All men are mortal; Mr. Morgan is mortal; therefore, Mr. Morgan is a man • Bonez is stupid; Bonez is a Pekingese; therefore, all Pekingese are stupid. • Bonez is stupid; Bonez is a Pekingese; therefore, some Pekingese are stupid.

3. Leading Questions Definition: A question which contains an assumption EX: Police have in custody someone they suspect of robbery. They bring the victim by and ask the suspect, “Is this the woman you robbed?” This is a leading question because it assumes that he robbed someone. A non-leading question would have been, “Did you rob this woman?” Question: Explain what is assumed with this leading question: “Did you enjoy spoiling the dinner for everyone else?”

4. Question: Identify if the question is leading or not. If so, explain what is assumed. • "Have you stopped cheating on your taxes?" • "Have you stopped taking advantage of your position as an advisor?" • "Are you happy with the mess your interruption has created?" • "Are you happy with the job that the repairmen have done?"

5. False Assumptions • Definition: when an author assumes a relationship between factors that leads to a conclusion the factors do not support • Sometimes a false assumption may be true. Sometimes the premise (a statement given to support an argument) may be true. HOWEVER, the issue is the logic of the argument. The conclusion being drawn is not logical based on the premise. The assumption made is false even if the conclusion is true. • Which sentence is a false assumption? A. Ice cream sales increase in the summer. B. Violent crimes increase during the summer. C. Ice cream causes violent crimes.

6. False Assumptions • There have been studies done on milk. From whymilk.org (the Got Milk? People who are actually the California Milk Processor board [hint, hint, they are trying to sell milk to make money!]): “Research suggests teen milk drinkers are less likely to suffer from type 2 diabetes as adults” • What is the false assumption they want people to make? • What are some other factors NOT being addressed that would prevent the false assumption?

7. False Assumptions (Osmosis is when a molecules can actually move through cell walls.) What is Garfield’s false assumption?