3.1 What Is A Deductive Argument?

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2.

A valid argument is one with the following property:if the premises are all true, the conclusion cannot be false.
- True
- False
Correct Answer

A. True

Explanation

True, by definition.

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2
3.

An argument can be both invalid and deductive.
- True
- False
Correct Answer

A. True

Explanation

True. This can be a tricky one to get.

If the argument is intended to be valid then it's deductive. But it may fail to be valid. Maybe the arguer mistakenly thinks an invalid argument form is really valid. So we'd call this a failed deductive argument, but it's still a deductive argument.

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2
4.

“Look, all spiders are poisonous, right? You’ve been poisoned, so you’ve definitely been bit by a spider!”
- A valid deductive argument
- An invalid deductive argument
Correct Answer

A. An invalid deductive argument

Explanation

This is invalid. That first premise doesn't say that ONLY spiders are poisonous, so in this world things other than spiders can poison you. But it's still deductive, since it's intended to be valid.

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1
5.

“Look, all spiders are poisonous, right? You got bit by a spider, so you’ve definitely been poisoned!”
- A valid deductive argument
- An invalid deductive argument
Correct Answer

A. A valid deductive argument

Explanation

This is valid, and the "definitely" indicates that it was intended to be valid as well, so it's also deductive.

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3.1 What Is A Deductive Argument?

A deductive argument is an argument that is intended to be valid.

Quiz Preview

A valid argument is one with the following property:if the premises are all true, the conclusion cannot be false.

An argument can be both invalid and deductive.

“Look, all spiders are poisonous, right? You’ve been poisoned, so you’ve definitely been bit by a spider!”

“Look, all spiders are poisonous, right? You got bit by a spider, so you’ve definitely been poisoned!”