On the other hand, a sound argument DOES need to have true premises and a true conclusion: Soundness: An argument is sound if it meets these two criteria: (1) It is valid. a.) Uncogent c.) a.) Unsound b.) Let A be a valid argument with a false conclusion. Also, keep in mind that an argument can be valid even if its premises are not actually true. Some unsound arguments are valid. A deductive argument may be valid or invalid, sound or unsound. If an inductive argument is weak, the logic connecting the premise and conclusion is incorrect. "If an argument has at least one false premise, it is unsound. Which of the following terms best describes the argument? If the premises don't imply the conclusion, then the argument is invalid" Here is an example of an unsound argument: 1. Validity and Soundness. Most Chinese people have dark hair. (t) If an argument is valid, it is impossible for all of the premises to be true and the conclusion false. But, for the premises to be false, only one need be false. (These are, remember, the two ways that an argument can be unsound.) All invalid arguments are unsound. If it is, then the argument is invalid. Note that in all four of the examples above, the conclusion can be true. An argument is sound iff it is valid and the premises are all true (which means the conclusion has to be true as well). By definition, a valid argument cannot have a false conclusion and all true premises. Although please remember that it can still be valid. A number of authors have expressed the view that the Williams-Stove argument is only valid if the sample S is drawn randomly from the population of possible samples—i.e., that any sample is as likely to be drawn as any other (Brown 1987; Will 1948; Giaquinto 1987). I am learning logic from its foundations and I am studying deductive arguments and reasoning, specifically validity. The sky is blue.) 17. So, an argument that is valid but unsound would have a conclusion that follows fromits premises, BUT has at least one false premise. A sound argument is a deductive argument which is valid and has true premisses. A valid deductive argument may or may not be sound. Okay so to me, both definitions pretty much says the same thing to me. We would call this an inductive argument because it’s obvious that the argument is intended to be strong, not valid. answer 2. TRUE: If an argument is sound, then it is valid … 2. FALSE: A valid argument must have a true conclusion only if all of the premises are true. So, it is possible for an argument to be valid and have false propositions, it just needs to be the case that if the premises were true, then the conclusion would also be true. 16. There is a very good reason for this. It is also in virtue of this form that the arguments are valid, for we can see that any argument of the same form is a valid argument. They are unsound because they do not have all true premises. A deductive argument is said to be valid if and only if it takes a form that makes it impossible for the premises to be true and the conclusion nevertheless to be false. For either example, the logic is valid but the premises are false. 2. I understand that a deductive argument is valid if and only if it is not possible that all of its premises are true and the conclusion that follows from those premises to be false. By replacing P and Q with appropriate sentences, we can generate the original three valid arguments. So, an argument with a mixture of true and false premises is still considered to be an argument with false premises--it is false that all of the premises are true. All premises are true and conclusion follows from the premises during sound and valid arguments. A deductive argument is valid if the conclusion necessarily follows from the premises and invalid if otherwise. 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