Reasoning and Decision Making

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Presentation transcript:

Reasoning and Decision Making 8.3

Reasoning Deductive Reasoning Reasoning is the use of information to reach conclusions. There are two main types of reasoning: deductive reasoning and inductive reasoning. In deductive reasoning, the conclusion is true if the premises are true. A premise is an idea or statement that provides the basic information that allows us to draw conclusions.

Reasoning, cont’d Inductive Reasoning In deductive reasoning, we usually start out with a general statement or principle and reason down to specifics that fit that statement or principle. In inductive reasoning, we reason from individual cases or particular facts to reach a general conclusion. In inductive reasoning, the conclusion is sometimes wrong, even when the premises are correct. Even though inductive reasoning does not allow us to be certain that our assumptions are correct, we use inductive reasoning all the time. Most sciences, including psychology, rely on inductive reasoning.

Reasoning, cont’d Weighing Costs and Benefits Making decisions means choosing among goals or courses of action to reach goals. When we make decisions, we weigh the pluses and minuses of each possible course of action. Making a balance sheet can help ensure that all available information has been considered. A balance sheet can also be helpful when a person is making a decision between two or more alternatives.

Decision Making: Shortcuts in Decision Making The Availability Heuristic The availability heuristic can help people make decisions on the basis of available information in their immediate consciousness. The Representativeness Heuristic Based on the representativeness heuristic, people make decisions about a sample according to the population that the sample appears to represent. The representativeness heuristic can be misleading.

Decision Making: Shortcuts in Decision Making, cont’d The Anchoring Heuristic The anchoring heuristic is the process of making decisions based on certain ideas or standards held by the decision maker. Family traditions, political beliefs, religion, and ways of life are common anchors.