CRITICAL THINKING - Fundamentals: Introduction to Critical Thinking [HD]
Summary
This video introduces critical thinking as the process of ensuring beliefs are supported by good reasons. It defines an argument as a set of premises leading to a conclusion. The distinction between deductive arguments, where premises guarantee the conclusion, and ampliative arguments, where premises make the conclusion probable but not certain, is explained. Understanding these concepts is crucial for evaluating the validity and strength of reasoning.
Key Insights
Critical thinking is about having good reasons for your beliefs.
Fundamentally, critical thinking is the practice of ensuring that one has solid justifications for the beliefs held. This involves distinguishing between good reasons, which make a belief probable or likely true, and bad reasons, which do not. The best reasons guarantee certainty. The importance of critical thinking lies in humanity's desire to be rational, which means wanting true beliefs and avoiding false ones. The most rational way to achieve this is by forming beliefs only when good reasons are found.
An argument consists of premises that support a conclusion.
An argument is defined as a set of statements, called premises, that collectively provide a reason for believing another statement, called the conclusion. A good argument is one where the premises offer a strong justification for the conclusion, meaning they make the conclusion likely to be true. Conversely, a bad argument's premises fail to adequately support its conclusion. Evaluating arguments for their goodness is a core skill in critical thinking.
Deductive arguments guarantee their conclusions.
In a deductive argument, if the premises are true, the conclusion MUST be true. The premises provide certainty and guarantee the truth of the conclusion. All the information needed to deduce the conclusion is contained within the premises themselves. An example is: 'Monty is in Beijing, and it's impossible to get from Beijing to the party in an afternoon'. If these premises are true, the conclusion 'Monty won't be at the party' is guaranteed.
Ampliative arguments make conclusions probable, not certain.
An ampliative argument is one where the premises provide support for the conclusion, making it probable or likely true, but do not guarantee its truth. Even if the premises are true, the conclusion could still potentially be false. An example is: 'Monty is really shy, and he rarely goes to parties.' While these premises suggest Monty probably won't attend, it's still possible he might decide to go. Critically evaluating arguments requires knowing whether they are intended to be deductive or ampliative.
Sections
What is Critical Thinking?
Critical thinking is about having good reasons for your beliefs.
Fundamentally, critical thinking is the practice of ensuring that one has solid justifications for the beliefs held. This involves distinguishing between good reasons, which make a belief probable or likely true, and bad reasons, which do not. The best reasons guarantee certainty. The importance of critical thinking lies in humanity's desire to be rational, which means wanting true beliefs and avoiding false ones. The most rational way to achieve this is by forming beliefs only when good reasons are found.
Good reasons are tied to truth, not morality.
The term 'good' when referring to reasons for belief in critical thinking is not related to morality or ethics. It is not morally right or wrong to believe something based on good or bad reasons, respectively. Instead, a 'good' reason is one that is closely linked to the truth of the belief, making it probable or likely to be true. The strongest reasons guarantee the truth of the belief.
What is an Argument?
An argument consists of premises that support a conclusion.
An argument is defined as a set of statements, called premises, that collectively provide a reason for believing another statement, called the conclusion. A good argument is one where the premises offer a strong justification for the conclusion, meaning they make the conclusion likely to be true. Conversely, a bad argument's premises fail to adequately support its conclusion. Evaluating arguments for their goodness is a core skill in critical thinking.
An argument's premises can be unrelated to its conclusion.
Not all sets of statements presented as arguments are good. For example, premises like 'I can't stand Monty' and 'I want to have a good time' do not logically support the conclusion 'Monty won't be at the party' because they are unrelated to the likelihood of Monty's attendance. A bad argument's premises do not make its conclusion any more probable. However, a bad argument could potentially become good if additional relevant premises are supplied.
Deductive vs. Ampliative Arguments
Deductive arguments guarantee their conclusions.
In a deductive argument, if the premises are true, the conclusion MUST be true. The premises provide certainty and guarantee the truth of the conclusion. All the information needed to deduce the conclusion is contained within the premises themselves. An example is: 'Monty is in Beijing, and it's impossible to get from Beijing to the party in an afternoon'. If these premises are true, the conclusion 'Monty won't be at the party' is guaranteed.
Ampliative arguments make conclusions probable, not certain.
An ampliative argument is one where the premises provide support for the conclusion, making it probable or likely true, but do not guarantee its truth. Even if the premises are true, the conclusion could still potentially be false. An example is: 'Monty is really shy, and he rarely goes to parties.' While these premises suggest Monty probably won't attend, it's still possible he might decide to go. Critically evaluating arguments requires knowing whether they are intended to be deductive or ampliative.
Distinguishing argument types is key to evaluation.
Recognizing whether an argument is intended to be deductive or ampliative is crucial for proper evaluation. If a deductive argument's premises do not actually guarantee the conclusion, it is a flawed argument. However, for an ampliative argument, the fact that the premises don't guarantee the conclusion is not a flaw; it's simply the nature of the argument. The goal of an ampliative argument is to offer probable reasons, not certainty.
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