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Tell whether each of the following arguments is a syllogism. If a penny has an Indian head on it, it was made before 1910 . If a penny has an Indian head on it, it is worth more than one cent. Therefore, if a penny was made before \(1910,\) it is worth more than one cent.

Short Answer

Expert verified
The argument is not a syllogism.

Step by step solution

01

Understand the Definition of a Syllogism

A syllogism is a form of reasoning where a conclusion is drawn from two given or assumed premises. Each of these premises share a common term with the conclusion. In a standard syllogism, the argument must follow a structure involving a major premise, a minor premise, and a conclusion.
02

Identify Premises and Conclusion

Identify the premises: - Premise 1: If a penny has an Indian head on it, it was made before 1910. - Premise 2: If a penny has an Indian head on it, it is worth more than one cent. Identify the conclusion: - Conclusion: Therefore, if a penny was made before 1910, it is worth more than one cent.
03

Analyze the Logical Structure

In a proper syllogism, the conclusion follows logically from the two premises. Here, the common term ('a penny has an Indian head on it') should appear in both premises, leading to a conclusion that links 'made before 1910' and 'worth more than one cent' directly through valid logical reasoning.
04

Evaluate the Argument Structure

Check if the argument adheres to a valid syllogistic form like modus ponens, modus tollens, or disjunctive syllogism. Neither premise directly links being made before 1910 to being worth more than one cent without the middle term ('Indian head'). The argument assumes a relation not explicitly stated in the premises voiced through transitive reasoning.
05

Conclusion on Syllogism

The logical structure is not syllogistic because the premises fail to directly converge on the conclusion without unjustified assumptions. They infer a correlation through the middle term which is not directly utilized to conclude a valid deductive argument form.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Logical Reasoning
Logical reasoning is a fundamental aspect of problem-solving that involves forming conclusions from given premises. It's crucial for evaluating the validity of arguments by linking statements together in a coherent way. In our exercise, we explored logical reasoning through syllogism, which is a type of deductive reasoning. Deductive reasoning starts from general premises and moves towards a specific conclusion.

When assessing logical arguments, ensure that terms are accurately related and that logical leaps (or assumptions) are avoided. This helps maintain the integrity of the reasoning process. Clear and logical connections between premises are paramount in determining if an argument's conclusion is valid. This exercise highlights the importance of ensuring every link in your reasoning chain is evident and logically sound.
Premises and Conclusion
In logical reasoning, understanding the relationship between premises and a conclusion is key. Premises are statements or facts upon which the reasoning is based, while the conclusion is the inference drawn from these premises.

In the example provided:
  • Premise 1: If a penny has an Indian head on it, it was made before 1910.
  • Premise 2: If a penny has an Indian head on it, it is worth more than one cent.
  • Conclusion: If a penny was made before 1910, it is worth more than one cent.
A strong argument requires a direct and logical connection between premises and conclusion. Here, the conclusion appears to skip a step, as it assumes a direct link between the date of manufacture and worth, without explicitly being stated in the premises. Ensuring clarity and logical consistency in premises and conclusions is vital to forming valid arguments.
Transitive Reasoning
Transitive reasoning is a type of logical reasoning where if "A" is related to "B" and "B" is related to "C," then "A" is assumed to be related to "C." In situations like our exercise, transitive reasoning comes into play with an implied connection not explicitly stated.

The premises in this exercise imply:
  • If a penny has an Indian head on it, then it was made before 1910 (A → B).
  • If a penny has an Indian head on it, then it is worth more than one cent (A → C).
The conclusion drawn attempts to connect "B" directly to "C," (i.e., 'made before 1910' to 'worth more than one cent'), relying on an unstated middle ground to infer a connection. Without explicitly evidencing this link, the use of transitive reasoning to reach this conclusion can be flawed. For conclusions to be validly drawn using transitive reasoning, each part of the logical chain needs to be clearly articulated and justified.

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Most popular questions from this chapter

Rewrite the statements in each of the following arguments in "if-then" form. Then, use symbols to represent the form of the argument and tell whether it is valid or invalid. Example: All movies directed by Alfred Hitchcock have suspensefül plots. The movie North by Northwest has a very suspenseful plot. Therefore, North by Northwest was directed by Alfred Hitchcock. Answer: If a movie was directed by Alfred Hitchcock, it has a suspenseful plot. If the movie is North by Northwest, it has a very suspenseful plot. Therefore, if the movie is North by Northwest, it was directed by Alfred Hitchcock. The form of this argument is \(a \rightarrow b\) \(c \rightarrow b\) Therefore, \(\quad c \rightarrow a\) The argument is not valid. All donkeys have long ears. All long-eared creatures are habitual eavesdroppers. Therefore, all donkeys are habitual eavesdroppers.

Decide which of the following statements are good definitions of the italicized words by determining whether or not their converses are true. Example: If it is New Year's Day, then it is January 1 Answer: A good definition because, if it is January \(1,\) it is New Year's Day. Dry ice is frozen carbon dioxide.

Statement D: Lady kangaroos do not need handbags. If it needs a handbag, then it is not a lady kangaroo.

Write the indicated statement for each of the following sentences. You cannot comprehend geometry if you do not know how to reason deductively. Converse.

The following statements appear on the customer agreement for obtaining a credit card. Statement 1. A transaction finance charge is a charge made if a new advance is added to your account. Statement \(2 .\) If you go over your credit limit, you will be charged a fee. Statement 3. A supercheck is a check designed for use with your credit card account. Statement 4. If you are charged a fee, the fee will be added to your new balance. Statement \(5 .\) If your card is lost or stolen, you agree to report it immediately. Which of these statements are definitions?

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