2.4 Strong Vs Weak Arguments

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| By Kdelapla
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2.4 Strong Vs Weak Arguments - Quiz

Quiz yourself on the terms and concepts you learned in this section!


Questions and Answers
  • 1. 

    An argument can be invalid but still qualify as a good argument.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    True. If it's strong then it'll qualify.

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  • 2. 

    An argument can have weak logic but still qualify as a good argument.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    False. Weak arguments violate the Logic Condition, by definition.

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  • 3. 

    Validity comes in degrees — you can have arguments that are “very valid”, “moderately valid”, etc.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    False. Validity is all-or-nothing, it doesn't come in degrees.

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  • 4. 

    The threshold between “weak” and “strong” arguments isn’t fixed or specified by logic. It’s a conventional choice that we make.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    True. The threshold between "weak" and "strong" arguments is a choice that we make, it's not dictated by logic.

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  • 5. 

    If an argument form is valid, like the one below … 1. All A are B 2. x is an A Therefore, x is a B … then all arguments that share this form are also valid.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    True. This is a fundamental property of valid argument forms, that they're FORMS. Validity is a property of the structural features of an argument, it's independent of the specific claims that are being asserted.

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  • 6. 

    1. Almost all movies filmed in the past decade are in black and white. 2. The Hunger Games movie was filmed in the past decade. Therefore, The Hunger Games is a black and white movie.

    • A.

      Strong

    • B.

      Weak

    Correct Answer
    A. Strong
    Explanation
    Strong. If the premises are true, the conclusion is very likely true. The first premise is in fact false, but that's irrelevant to assessing the logic of the argument.

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  • 7. 

    1. Almost all movies filmed in the past decade are in black and white. 2. The Hunger Games movie is a black and white movie. Therefore, The Hunger Games was filmed in the past decade.

    • A.

      Strong

    • B.

      Weak

    Correct Answer
    B. Weak
    Explanation
    Weak. Even granting the premises, the conclusion would not follow with high probability. One could have many movies filmed prior to the past decade that were also in black and white.

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  • 8. 

    1. If I study hard then I’ll pass the final exam. 2. I passed the final exam. Therefore, I studied hard.

    • A.

      Valid

    • B.

      Strong

    • C.

      Weak

    Correct Answer
    C. Weak
    Explanation
    Weak. The premises don't say that the ONLY way to pass the final is to study hard. They only say that IF I study hard then I'm sure to pass. But I could still pass without studying hard (because the questions were easy, because I cheated, because I'm really smart, and so on...).

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  • 9. 

    1. Very few people are taller than 7 feet. 2. James is a person. Therefore, James is not taller than 7 feet.

    • A.

      Valid

    • B.

      Strong

    • C.

      Weak

    Correct Answer
    B. Strong
    Explanation
    Strong. Given the premises, it's very likely that James is not taller than 7 feet.

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  • 10. 

    “90% of the people surveyed at my local church support capital punishment. This gives us reason to believe that most Americans support capital punishment.”

    • A.

      Valid

    • B.

      Strong

    • C.

      Weak

    Correct Answer
    C. Weak
    Explanation
    Weak. The sample is too small and unrepresentative to let us infer that most Americans think the same way as the local church goers about capital punishment.

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