PT152 S2 Q19 ExplanationSome species of tarantula

Answer choices, explained

1. A

   Correct54% picked this

   None of the poetry written by Strawn has a regular meter. But some of the poems in this collection have a regular meter. Therefore,

   Why this is right

   Our two premises are None and Some, and our conclusion is Some, so this is worth reading. Premise 1: Some A's are B. Some poems in this collection have a regular meter. Premise 2: No C's are B. No written by Strawn have regular meter. Conclusion: Not all A's are C. Some poems in this collection are ~written by Strawn. (Some A's are ~C) Everything matches up!

   Skill tested: Parallel · how this choice captures the argument's function is the move to repeat next time.

   54%
2. B

   Bad Premise Match11% picked this

   Some of the poems in this collection have a regular meter. However, some of the poetry written by Strawn does not have a regular

   Our two premises are Some and Some, so there's no need to read this one. We needed a Some/Not All premise and a No/All premise. Premise 1: Some A's are B. Premise 2: No C's are B. Conclusion: Not all A's are C. (Some A's are ~C)

   11%
3. C

   Invalid Logic Bad Conclusion Match28% picked this

   Some of the poetry written by Strawn has a regular meter. However, this collection contains no poetry written by Strawn. Therefore, not all of

   Our two premises are Some and No, and our conclusion is Not All, so this is worth reading. Premise 1: Some A's are B. Some WBS is RM. Premise 2: No C's are B. No PIC is WBS. Conclusion: Not all A's are C. Some PIC are ~RM. (Some A's are ~C) (PIC = poems in this collection) (RM = regular meter) (WBS = written by Strawn) The logic on this one doesn't work. The 2nd premise is a conditional that says, PIC → ~WBS WBS → ~PIC Does the 1st premise talk about PIC or WBS? Yes, it says, "Some RM is WBS", which allows us to conclude "Some RM is ~PIC". So the correct conclusion that should have been drawn is, "Some poetry with regular meter is not in this collection" also known as "Not all poetry with regular meter is in this collection". Instead, we got a conclusion saying "Not all poetry in this collection has regular meter" also known as "Some poetry in this collection does not have regular meter". Saying "some poetry with regular meter is not in this collection" is not the same thing as saying "some poetry in this collection does not have regular meter". "Some people at my party have not been to Mars" is a different claim from saying "Some people who have been to Mars were not at my party"

   28%
4. D

   Bad Conclusion Match5% picked this

   Some of the poems in this collection were written by Strawn. However, none of the poems in this collection has a regular meter. Therefore,

   Our two premises are Some and None, but our conclusion is only, which is the same strength as No/All (conditional). So there's no need to read this one. The conclusion also brings in a brand new idea, unpublished poetry by Strawn. Premise 1: Some A's are B. Premise 2: No C's are B. (this answer choice) Conclusion: Not all A's are C. vs. Only D is B (Some A's are ~C)

   5%
5. E

   Bad Premise Match2% picked this

   No poems with a regular meter are found in this collection and none of the poetry in this collection was written by Strawn. Therefore,

   Our two premises are No and None, so there's no need to read this one. We needed a Some/Not All premise and a No/All premise. Premise 1: Some A's are B. Premise 2: No C's are B. Conclusion: Not all A's are C. (Some A's are ~C)

   2%