Sufficient Assumptions

[hnadgauda]

On page 58 of the LR Strategy Guide, it says the following

A successful person is also a smart person. [NOT sufficient]

A successful person is also a funny person. [NOT sufficient]

A successful person is also a smart and funny person. [IS sufficient]

I understand why they are all necessary assumptions because of the negation test; they are all required to reach the conclusion of "Therefore, Johnson is both smart and funny" from the premise of "Johnson is successful".

I don't understand why these statements are classified this way in the sufficient category. Can you please explain why?

Thanks!

[ohthatpatrick]

"Sufficient" means "if added to the evidence, it would allow us to derive the conclusion".

So if we add #1 to the evidence, we have:
Jon is successful.
A successful person is also a smart person.


Ask yourself, "What idea (if any) can I derive from these claims?"

Answer: Jon is a smart person.

Can we derive "Jon is a smart and funny person"?

Of course not. I have no idea whether Jon is funny, when all I know is
Jon is successful.
A successful person is also a smart person.


For the 2nd one, we could derive that Jon is funny, but couldn't derive that Jon is smart.

For the 3rd one, our evidence looks like this:
Jon is successful.
A successful person is also a smart and funny person.


HERE, we can derive that Jon is smart and funny.

Hope this helps.

[NathanialG687]

As a result of the assumption, we may think an individual will act surely. At that point we are found napping when they act in an unexpected way.
We made a assumption and set up a desire that the individual would carry on a specific way. The issue emerged when they carried on in a way that did not satisfy your desires.




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[NathanialG687]

As a result of the assumption, we may think an individual will act surely. At that point we are found napping when they act in an unexpected way.
We made a assumption and set up a desire that the individual would carry on a specific way. The issue emerged when they carried on in a way that did not satisfy your desires.