Quiz 1 - KEY
1. Which of the following combinations of truth-values cannot exist in
a valid argument?
True premises and a false conclusion
True premises and a true conclusion
False premises and a true conclusion
False premises and a false conclusion
2. When a term is vague, which of the following is true? Select all that
apply.
The extension of the term is unclear.
There is uncertainty regarding the soundness of the members of the class in the term.
The intension of the term is unclear.
There is uncertainty over which things belong to the class that is denoted by the term.
3. Validity is to soundness as strength is to....
relative soundness!
cogency
hardness
truth-value
4. Which of the following is true of a strong inductive argument?
It is impossible to have true premises and a false conclusion at the same time.
It is irrational to accept the conclusion, because the argument isn't deductive.
If the premises are true, the conclusion will be necessarily true.
If the premises are true, it is probable that the conclusion will be true as well.
Quiz 2 - KEY
1. What kind of fallacy does the following argument commit?
"When a car breaks down so often that repairs become pointless, the car is thrown on the junk heap.
Similarly, when a person becomes old and diseased, he or she should be mercifully put to death."
False Analogy
Straw Man
Ad Hominem
Slippery Slope
2. Which fallacy does the argument commit?
P1) Birds can fly.
P2) Emus are birds.
C) Therefore, emus can fly.
Accident
Straw Man
Ad Hominem
False Cause
3. You commit the appeal to ignorance fallacy when you accuse the reader or listener
of being ignorant.
True
False
4) "Mr. Fisk claims that a happy marriage requires honesty, loyalty, and respect towards one's
partner. He also emphasizes the importance of spending quality time with each other. But let me
remind you of what Fisk is: a heinous criminal, who not only killed people but damaged the fabric of
our city through his corruption. His romantic advice will be wrong."
Which fallacy did the speaker commit?
Ad hominem
Red herring
Accident
False dichotomy
5.
(1)
fallacies are problems with the form of a deductive argument that
make the argument invalid.
(2)
fallacies, on the other hand, depend on
the content of an argument.
1: Formal, 2: Informal
1: Informal, 2: Formal
1: Structural, 2: Essential
1: Essential, 2: Structural
Quiz 3
1. "Either Breitling has a diamond model and Rado advertises a calendar watch
or Tissot watches have luminous hands."
Which of the following choices correctly translates this sentence into
propositional logic?
B V (R • T)
(B V R) • T
(B • R) V T
B•RVT
B • (R V T)
2. "Piaget has a gold watch only if both Seiko has leather bands and Breitling
has a diamond model."
Which of the following correctly translates this sentence into propositional logic?
correct
3) "Seiko has a quartz watch if and only if either Movado does not offer a silver
dial or Rado does not have a calendar watch; however, Tissot has luminous
hands only if both Fossil is water resistant and Rado has a calendar model."
Which of the following choices correctly translates this sentence into
propositional logic?
Correct!
* correct
4) Consider the following
proposition:
The main operator in this proposition is...
•You Answered
~
()
5)
Based on its truth table, the preceding proposition has the property of being
________.
Self-Contradictory
Tautologous
Contingent
Self-Consistent
6) Assume that A and B are true, while X and Y are false. What is the truth-value
of this argument?
True
False
Quiz 4
1) Select the conclusion that follows in a single step from the given premises
(along with the rule of inference).
_____________
[ __ , ___ ]
[2, Add]ct!
~T [2, Simp]
[2,3, MT]
[2, Add]
2) If you go to the beach, you'll be eaten by a shark. If you're eaten by a shark,
you won't be able to take your test next Wednesday. So if you go to the beach,
you won't be able to take that test next Wednesday.
What rule of inference am I using to arrive at the conclusion?
Constructive dilemmaCorrect!
Pure hypothetical syllogism
Modus ponens
Addition
3) Imagine I want to prove the following statement:
Which statement should I assume on the line that begins my conditional proof?
ct!
A
4) The truth-table for the following proposition would contain how many rows?
!
8
16
6
4
5) Which of the following is not a potential translation of
"X, but Y also."
"X; however, Y."
"X and Y."Correct!
"X only if Y."
?