PHIL 1180 Chapter 3
A strong argument must have a true conclusion.
False
A weak argument must have a false conclusion.
False
All strong arguments are cogent.
False
All unsound arguments are invalid.
False
All unsound arguments have a false conclusion.
False
All unsound arguments have at least one false premise.
False
All valid arguments are sound.
False
An argument is a disagreement between two people.
False
An argument must have two or more premises.
False
An argument's being valid implies that it is sound.
False
Cogent arguments are sound.
False
Deductive arguments with all true premises are sound.
False
Every argument claims to be valid.
False
Every inductively strong argument is cogent.
False
Every invalid deductive argument has true premises and a false conclusion.
False
If a deductive argument has true premises, then its conclusion must be true.
False
If an argument has true premises, then it cannot have a false conclusion.
False
If an argument is invalid and has true premises, then the conclusion must be false.
False
If an argument is uncogent and has false premises, then it must be weak.
False
If an argument is unsound, then it is both invalid and has at least one false premise.
False
If an argument is valid and has false premises, then the conclusion cannot be true.
False
If an argument is valid, then its conclusion must be true.
False
If an inductive argument has true premises, then the conclusion is probably true.
False
Invalid deductive arguments always have false premises.
False
Some arguments are more or less invalid.
False
Some deductive arguments are more valid than others.
False
The conclusion of a weak argument with true premises will probably be false.
False
To be cogent an argument must have true premises.
False
To be valid an argument must have true premises.
False
Uncogent arguments are always weak.
False
Abraham Lincoln wore a beard. Abraham Lincoln was very tall. Therefore, all tall mean wear beards.
Invalid with all true premises
a bicycle is slower than a car. a car is slower than a fighter jet. so, a bicycle is slower than a fighter jet.
Sound - all true premises
A valid argument would be unsound if it had false premises.
True
All cogent arguments are strong.
True
All sound arguments are valid.
True
An argument must have at least one premise.
True
An argument with all true premises and a false conclusion cannot be valid.
True
An argument's being invalid implies that it is unsound.
True
An argument's being sound implies that it is valid.
True
Deductive arguments are either valid or invalid.
True
Every argument makes an inferential claim.
True
False sentences are statements.
True
If an argument is strong and has true premises, then the conclusion is probably true.
True
If an argument is uncogent but strong, then it must have false premises.
True
If an argument is unsound, then it is invalid or it has at least one false premise.
True
If an article is uncogent and has true premises, then it must be weak.
True
Some arguments with all true premises are invalid.
True
Some arguments with all true premises are strong.
True
Some inductive arguments are stronger than others.
True
Some inductive arguments are weaker than others.
True
Some inferential claims are false.
True
Some valid arguments are unsound.
True
Some valid arguments have false conclusions.
True
Some valid arguments have false premises.
True
Sound deductive arguments have all true premises.
True
The conclusion of a valid argument with true premises will be true.
True
The difference between an inductive and a deductive argument is in the kind of inferential claim they make.
True
The inferential claim of an inductive argument is that the conclusion is probably true given the premises.
True
a bear is bigger than a mouse. a mouse is bigger than a fox. consequently, a bear is bigger than a fox
Valid with at least one false premise
All sound arguments are persuasive
false
All strong arguments are persuasive
false
If a deductive argument has true premises and a true conclusion, then it is valid
false
New facts can turn a valid argument into a invalid argument
false
The conclusion of an invalid argument with true premises will be false
false
Uncogent arguments are always weak
false
an argument must have at least two premises
false
an inductive argument is strong if it is persuasive
false
every sentence is a statement
false
if a deductive argument has false premises and a false conclusion, then is is invalid
false
if an argument is unsound and has true premises, then the conclusion cannot be true
false
inductive arguments with true premises are cogent
false
inductive arguments with true premises are strong
false
invalid arguments always have false conclusions
false
unsound arguments have true conclusions
false
apples are fruit. oranges are fruit. so apples are oranges
invalid with all true premises
a turtle is slower than a dog. a dog is slower than a horse. so, a turtle is slower than a horse.
sound - valid with all true premises
If an argument is valid and has true premises, then the conclusion cannot be false
true
New facts can turn a strong inductive argument into a weak argument
true
The conclusion of a weak argument with true premises will probably be true
true
The inferential claim of a deductive argument is the claim of validity
true
a deductive argument cannot be almost valid
true
a deductive argument cannot be somewhat valid
true
arguments with false conclusions are never sound
true
cogent arguments are inductively strong
true
cogent inductive arguments have true premises
true
if all premises are true and the conclusion is false, then the argument cannot be valid.
true
if an argument is weak then it cannot be cogent
true
to be sound an argument must have true premises
true
The sun is purple. the moon is purple. so the sun is the same color as the moon.
valid with at least on false premise (unsound)
A turtle runs faster than a dog. a dog runs faster than a horse. so, a turtle runs faster than a horse.
valid with at least one false premise - unsound
