Judgement, Decisions, Reasoning Flashcards
Inductive reasoning
One of the primary mechanisms in making judgements by drawing general conclusions based on specific observations and evidence.
The conclusions are probably but not definitely true
Factors that contribute to how strong (more likely) an inductive argument is:
1) Representativeness of observations: How well do your observations represent all members of that category?
2) Number of observations: more observations = more support
3) Quality of evidence
Heuristics
Used in reasoning because they provide shortcuts to help us generalize from specific experiences to more general conclusions.
Availability heuristic
Events that are more easily remembered are judged to be more probable
Availability heuristic errors
Illusory correlation: when a relationship between two events seems to appear but in reality there is no relationship or it is much weaker
How do illusory correlations result in stereotypes and maintain them?
A stereotype about the characteristics of a particular group may lead people to pay particular attention to behaviours associated with that stereotype, and this attention creates an illusory correlation that reinforces the stereotype.
Selective attention to the stereotypical behaviours makes these behaviours more “available”
Representativeness heuristic
Making judgements based on how much an event resembles other events
Ex; Robert wears glasses, speaks quietly, and reads a lot. Is he a librarian or farmer?
▪ Most people chose librarians
▪ However, they were ignoring the base rate that there are more farmers than librarians in Robert’s town
Representativeness heuristic errors
Ignoring the base rate: relative proportions of different classes in a population
Ignoring the conjunction rule: the probability of the conjunction of two events cannot be higher than the probability of a single event occurring alone
Ignoring law of large numbers: The larger the number of individuals that are randomly drawn from the entire population, the more representative the resulting group will be of the entire population
Myside bias
Explains how attitudes can affect judgement.
Type of confirmation bias where people’s prior beliefs may cause them to attend to information that corresponds with their beliefs and to disregard information that does not
Generate and test hypotheses in a way that is bias to own opinions and attitudes
Confirmation bias
Explains how attitudes can affect judgement
Tendency to selectively look for information that conforms to our hypothesis and to overlook information that argues against it
Broader than myside bias because it holds for any information, not just attitudes and opinions.
Backfire effect
Occurs when individuals’ support for a particular viewpoint becomes stronger when faced with facts opposing their viewpoint
What can the backfire effect explain?
It can explain why conversations between people with strong opposing views, such as politicians, seems counterproductive. With each new opposing fact presented, the other clings to their own beliefs.
Deductive reasoning
Drawing logical predictions about specific cases based on broad principles.
The conclusion can be definitely true but only if both premises are definitely true and if the form of the syllogism is valid
Syllogism
Two premises followed by a conclusion. The conclusion can follow from the premises based on the rules of logic
Categorical syllogism
A syllogism in which the premises and conclusion describe the relationship between two categories by using statements that being with All, No, or Some
Example of a categorical syllogism
Premise 1: All ‘A’ are ‘B’
Premise 2: All ‘B’ are ‘C’
Conclusions: Therefore, all ‘A’ are ‘C’
When a syllogism is valid…
the form of the syllogism indicates that its conclusions follows logically from its two premises
If the syllogism is valid that does not mean it is _______
true
Syllogism can have truth but no validity and…
validity but no truth.
Belief bias
tendency to think a syllogism is valid if its conclusion is believable OR that it is invalid if the conclusion is not believable