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sangagul1234ah@gmail.com January 14, 2021

I diagrammed choice A wrong

I didn't diagram employment w/ TRF and the opportunity for dental insurance as a compound statement. Instead I did TRF --> O , O --> PDI (purchased Dental Insurance) , PDI --> SD (saw dentist). c: not SD --> not TRF The reason I crossed out choice A is that it had used the contrapositive transitive chain instead of simply transitive like in the passage. Is my thinking wrong or is my diagramming wrong? how can I avoided committing the same mistake?

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shunhe January 15, 2021

Hi @sangagul1234ah@gmail.com,

Thanks for the question! The issue isn’t about whether or not there’s a compound statement. The issue is about the term shift in the answer. The first premise refers to people who are employed by TRF AND purchased dental insurance. But the conclusion is about the people who are employed by TRF, which is a larger group. The first group is a subset of the second. So the conclusion is about a broader group, and we can’t generalize to it. Whereas the conclusion in the original stimulus is about the smaller group. So make sure you’re reading carefully what the exact terms you’re diagramming are.

Hope this helps! Feel free to ask any other questions that you might have. Hi @sangagul1234ah@gmail.com,

Thanks for the question! The issue isn’t about whether or not there’s a compound statement. The issue is about the term shift in the answer. The first premise refers to people who are employed by TRF AND purchased dental insurance. But the conclusion is about the people who are employed by TRF, which is a larger group. The first group is a subset of the second. So the conclusion is about a broader group, and we can’t generalize to it. Whereas the conclusion in the original stimulus is about the smaller group. So make sure you’re reading carefully what the exact terms you’re diagramming are.

Hope this helps! Feel free to ask any other questions that you might have.