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- Joined: Mar 28, 2020
I'm having a bit of difficulty fully understanding Problem Set #2 on page 635 of the Logical Reasoning Bible.
2. Two things are true of all immoral actions. First, if they are performed in public, they offend public sensibilities. Second, they are accompanied by feelings of guilt.
I have no problem interpreting the Stimulus. I was able to identify that the two sufficient conditions addressed are not the same (as the Answer Key stresses), and diagrammed two conditional relationships:
Immoral Actions (public) Offend
Immoral Actions Guilt
Now using my knowledge from the Chapter, if a Cannot Be True question contains conditional reasoning, I should be searching for an answer that proves the sufficient condition can occur without the necessary condition occurring (because that would be false)****
Now I try to diagram each of the answer choices to find the (as mentioned above) false relationship:
(A) Some immoral actions that are not performed in public are not accompanied by feelings of guilt.
So my first reaction to this answer is huh, they're relating immoral actions not performed in public to guilt. I look at my two Stimulus diagrams and see that one contains one of the elements (immoral actions associated with public) and the other contains the other element (guilt). So this leaves me a bit confused in terms of coming up with a diagram to illustrate answer choice (A). But then I think, I guess "Immortal Actions" includes both in public and not in public? So does "immoral actions that are not performed in public" also equate to "immoral actions?" In other words, can I use simply the second diagram?
Immoral Actions (both in public and not in public) Guilt
If my logic so far is correct... then I can diagram the answer choice as:
Immoral actions (both in public and not in public) Guilt
Which is the incorrect relationship I was looking for. This answer proves the necessary condition is not in fact necessary, and is therefore incorrect -- which is the right answer, just unsure if my logic is correct.
Also, would you mind double-checking my logic in eliminating the rest of the answer choices?
(B) Immoral actions are wrong solely by virtue of being accompanied by feelings of guilt.
Assessing immoral actions as "wrong" seems out of left field (not talked about in the stimulus), so I eliminate this choice because of that.
(C) Some actions that offend public sensibilities if they are performed in public are not accompanied by feelings of guilt.
The stimulus addresses "immoral actions" and this answer choice addresses "some actions," so I don't even bother diagramming, and eliminate.
(D) Some actions that are accompanied by feelings of guilt are not immoral, even if they frequently offend public sensitivities.
Diagramming the first part of this answer choice (relationship between not immoral actions and guilt):
But these "immoral actions" are not specified in the answer choice as having occurred in public, so how do I make a connection to whether or not they offend public sensitivities, if that condition is required for immoral actions performed in public? I don't really know where to go from here?
(E) Every action performed in public that is accompanied by feelings of guilt is immoral.
This is a Mistaken Reversal... which we've learned is an invalid inference? The bible describes a Mistaken Reversal as might be true, but I don't understand why.
****So I guess another question I have is (relating to what I learned from the Chapter, and referred to at the beginning of this post), why is the only false answer the necessary condition not occurring, while the sufficient condition occurs? Why are Mistaken Negation and Mistaken Reversals not also false (as we know they are invalid inferences)?
Thank you! Hope I was fairly clear...