Fallacies Flashcards
(34 cards)
Induction
Inferring from the properties of a sample to the properties of a population as a whole.
Ex. 1,000 beans. Some are black, some white. Take a sample of 100. Half are white, half are black. Then infer that 500 are white and 500 are black.
Ignoring the question
Simply avoiding answering questions which one has no good response for.
Ex. The question might be whether the U.S. should increase the number of troops in Afghanistan. To ignore the question would be to ask whether war is morally wrong.
False analogy
Basing an argument on an inappropriate association of unrelated items.
Ex. Employees are like nails. Just as nails must be hit in the head in order to make them work, so must employees.
Deduction
Argument that is invalid. Where it goes wrong and is no longer a logical process.
Ex. All birds have beaks, that creature has a beak, so that creature is a bird.
Syllogism
Used to form incorrect conclusions that are odd.
Ex. All crows are black and the bird in my cage is black. So the bird in my cage is a crow.
Argumentum ad hominem
latin for against the person.
Ex. The movie was horrible the lead actor has a gambling problem. The actor having a gambling problem isn’t relevant to why the movie was horrible.
Ad vericundiam
Using a celebrity or authority figure to verify the worth of a product.
Ex. UFOs aren’t real because Obama said so.
Composition
Generalizing that since a part of a whole has a certain property, the whole must also have that property.
Ex. Tigers eat more food than humans. So a group of tigers eats more food than all humans on earth.
Ad populum
Using emotionally loaded diction to garner support.
Ex. Of course he’s easygoing, he’s from California.
Division
the apostles of jesus were 12. does that mean matthew was 12?
Ex. Bill lives in a large building, so his apartment must be huge.
Dicto simpliciter
Making a general statement and arguing that it will apply to specifics.
Ex. Exercise is good. Therefore everybody should exercise.
Either/or fallacy
always runs the risk of ignoring a third or fourth possibility.
Ex. If we don’t not invest in mass transit within the next few years, we will be unable to reverse the trend of cars taking over the roads. It’s not true.
Post hoc ergo propter hoc
after this, therefore because of this.
Ex. Crime is highest during the summer. Thus the heat of summer causes an increase in crime.
Composition
the reasoning commits the error of arguing from the true premise that each member of a group has a certain property to the not necessarily true conclusion that the group (the composition) itself has the property.
Ex. Tanks use more fuel than cars. Tanks use up more of the available fuel in the world than do all the cars.
Hasty generalization
the precipitous move from true assertions about one or a few instancces, to dubious or even false assertionas about all.
Ex. My father smoked four packs of cigarettes a day since age fourteen and lived until sixty nine. Therefore, smoking can’t be that bad for you.m
Premise and the common ground
Establishing common ground to push your premise
Ex. Anyone that Muslim is a threat to this country and that’s a fact.
Hypothesis contrary to fact
Makes a hypothesis about what would have happened had something else not occurred.
Ex. If you took that course in CD player repair right out of high school, you would be doing well and gainfully employed right now.
Equivocation
giving utterance to two meanings at the same time in one word or phrase. it can ruin good reasoning.
Ex. I have a right to watch cartoons. It’s right for me to watch now. So I think I’ll do that instead of study for my exam.
Faulty dilemma
Claiming that either one or the other option is true. If one is false, then the other must be true, when actually both could be false.
Ex. Look you have to decide. Either you can afford this stereo or we do without music for awhile.
Ad misericordiam
Appeal to pity or sympathy- like pathos.
Ex. A lawyer defending a client accused of assault might argue that the client has a stressful work environment and s demanding family. The lawyer is arguing for pity based in the clients level of stress, and is evading the question of whether the client committed the assault.
Non sequitur
latin for it does not follow, the claim does not follow from the grounds. the conclusion doesnt follow the premises.
Ex. He’s so charismatic. He must be really knowledgeable. A reasonable person can’t logically conclude that someone who is charismatic must also be knowledgeable.
Analogy begging the question
Assuming the conclusion of an argument, a type of circular reasoning.
Ex. The belief in God is universal. Everyone believes in God.
Contradictory premise
Argument that draws a conclusion from inconsistent of incompatible premises.
Ex. If God can do anything then he can make a stone so heavy that even he himself won’t be able to lift it. But he can do anything so he can lift it… When they contradict each other.
Guilt by association
When a person rejects a claim simply because it is pointed out that people she dislikes accept the claim.
Ex. Justin owns a gun. Terrorists own guns, therefore he’s a terrorist.