PHI 111-Copi,Ch. 7 FullQuiz (21 docx Compatibility Mode Saved to this PC Design
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PHI 111-Copi,Ch. 7 FullQuiz (21 docx Compatibility Mode Saved to this PC Design Layout References Mailings Review View Help Tell me what you want to do ghazaleh hn 7. "No person who cries is a person who can be trusted. Fred is a logic professor. No untrustworthy person is a logjic professor. Therefore, Fred does not cry. To tell if this argument is valid, we must a. choose the relevant premises for deriving the conclusion and test the resulting syllogism for validity. The other premises are not relevant and need not be tested b. first derive the conclusion, "some logic professors do not cry," and test that syllogism for validity c. first derive the conclusion, "Fred is a trustworthy person," and test that syllogism for validity Then test a second syllogism, which has that conclusion as a premise. d. do nothing, since this argument is illogical. The conclusion cannot be derived from what is given. Answer: 8. "Either I play ball, or I keep my new shoes clean. I can't resist playing ball, so I guess my new shoes will be getting dirty. How should we label this argument? a. An invalid argument that contains extraneous material b. Denying the antecedent. c. Modus tollens d. Disjunctive syllogism Answer 9. Starting with the major premise, "If the heater is turned on, then the house will get warm," which of the following completed arguments commits the fallacy of affirming the consequent? a. The heater is turned on, so the house is warm. b. No one turned the heater on, so the house must be cold. c. The house is warm, so someone must have turned on the heater. d. The house is cold, so we know that no one turned on the heater. Answer 10. "Either I keep eating beef and get a heart attack, or I quit and eat yucky vegetables. Since I know I must either eat beef or not, I know I will be stuck either with yucky vegetables or a heart attack." To escape between the horns of this dilemma, I might argue a.l haven't really considered the alternatives, though. I can always learn to exercise more so that eating beef won't give me a heart attack b. Now that I think of it, the outlook isn't so bleak. Lots of people manage on vegetables. I'll start eating more vegetables now so that I can avoid heart disease later Prtscn Home End PUp F3 FS F6 F7 F8 F9 F10Explanation / Answer
7. Syllogism is a form of deductive reasoning. Here, the premises or inferences are checked for the validity of the conclusion. For an argument to be valid, it is necessary that premises should be true, when premises or inferences are true, then it is impossible for the conclusion to be false.
Answer. Option C. First derive the conclusion, "some logic professors do not cry", and test that syllogism for validity. Then test a second syllogism, which has that conclusion as a promise.
8. Disjunctive Syllogism also known as Modus tollendo ponens is a form of valid argument. The disjunctive Syllogism goes with the form "P or Q, not P, therefore Q".
Answer. Option d. Disjunctive Syllogism.
9. In the given sentence " the house is warm" is the consequence that is affirmed by stating that the antecedent is true. The house could be warm due to other reasons as rise in room temperature due to climatic change, other than the antecedent. Hence,
Answer. Option c. The house is warm, so someone must have turn on the heater.
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