PHL 215-01

5.5:  Some phoilosophers were born in TX. Irvine is a philosopher. Therefore Irvine was born in TX.

Good logic: deductive (guaranteed conclusion) / inductive (≥50% probability)

3-1 (Bold=true italics=false)

1. Anyone who lives in Dayton lives in Ohio.
Anyone who lives in Ohio lives in the United States.
Therefore, anyone who lives in Dayton lives in the United States.
Check all that apply: premises all true 9      logic good 9       good argument 9
2. No American president has been Jewish.
Clinton was an American president.
Therefore, Clinton wasn’t Jewish.
Check all that apply: premises all true 9      logic good 9       good argument 9
3. George Bush is the Pope.
The Pope lives in the Vatican.
Therefore, George Bush lives in the Vatican.
Check all that apply: premises all true 9 logic good 9 good argument 9
4. All roses are red.
All violets are blue.
Therefore, George Bush loves his wife.
Check all that apply: premises all true 9      logic good 9       good argument 9

2-2

Exercise 2-2. Determine whether the following arguments have good or bad logic. If they have bad logic, say so; if
they have good logic, tell whether it is good deductive logic or good inductive logic.
1.  Most people have two kidneys.
Dr. Irvine is a person.
Therefore, Dr. Irvine has two kidneys.
Check one: bad logic 9           good deductive logic 9 good inductive logic 9
2.  All people live in Fairborn, Ohio.
Dr. Irvine is a person.
Therefore, Dr. Irvine lives in Fairborn, Ohio.
Check one: bad logic 9           good deductive logic 9        good inductive logic 9
3.  Some people have only one kidney.
Dr. Irvine is a person.
Therefore, Dr. Irvine has only one kidney.
Check one: bad logic 9 good deductive logic 9        good inductive logic 9
4.  Somewhere between 80 and 90 percent of the students in this class will get a passing grade.
You are a student in this class.
Therefore, you will get a passing grade in this class.
Check one: bad logic 9           good deductive logic 9        good inductive logic 9

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