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# Types of Conclusion on CR

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Types of Conclusion on CR [#permalink]

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02 Sep 2011, 00:31
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Hi All,

We all know that most CR questions (except the one in which we need to draw a conclusion) provide a conclusion and that the Conclusion proposes a relationship between different Entities.

I was wondering what are the main types of Conclusion (i.e. relationship between entities) on CR questions? The following comes to my mind:

#1 (most important and perhaps ) Causality between different Entities (X leads to Y).
#2 Correlation between different entities (X increases when Y increases or decreases).
#3 Moderating influence on a relationship (i.e. X leads to Y only if Z is present or absent).

The benefit of knowing all the major types of relationships is that this can allow us to pre-think an answer based on the specific type (for instance, we know that causality can be strengthened or weakened by different evidences)

Are there any other main types of conclusions? If yes, please share. Thanks!
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Re: Types of Conclusion on CR [#permalink]

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02 Sep 2011, 01:41
vinayrsm wrote:
Hi All,

We all know that most CR questions (except the one in which we need to draw a conclusion) provide a conclusion and that the Conclusion proposes a relationship between different Entities.

I was wondering what are the main types of Conclusion (i.e. relationship between entities) on CR questions? The following comes to my mind:

#1 (most important and perhaps ) Causality between different Entities (X leads to Y).
#2 Correlation between different entities (X increases when Y increases or decreases).
#3 Moderating influence on a relationship (i.e. X leads to Y only if Z is present or absent).

The benefit of knowing all the major types of relationships is that this can allow us to pre-think an answer based on the specific type (for instance, we know that causality can be strengthened or weakened by different evidences)

Are there any other main types of conclusions? If yes, please share. Thanks!

If you just talking about causal relationships, please go through chapter 7, "CAUSE AND EFFECT REASONING", in CR bible.

Refer this:
powerscore-critical-reasoning-bible-full-chapter-notes-115864.html#p937472
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Re: Types of Conclusion on CR [#permalink]

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02 Sep 2011, 02:23
Hi Fluke,

No, I am not talking about only Causal Relationship. I have gone through Powerscore CR.
My question is that causal relationship represents ONLY one type of relationship stated in CR conclusions, what are the other types of relationship that can be present in the conclusions? I hope I am more clear in my question.
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Re: Types of Conclusion on CR [#permalink]

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07 Sep 2011, 08:45
hmm.... nobody thinks that there are other types of conclusion except Causal ones?
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Re: Types of Conclusion on CR [#permalink]

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07 Sep 2011, 15:57
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vinayrsm wrote:
Hi All,

We all know that most CR questions (except the one in which we need to draw a conclusion) provide a conclusion and that the Conclusion proposes a relationship between different Entities.

Are there any other main types of conclusions? If yes, please share. Thanks!

Hii vinay,

Well for now I can't share all possible types of conclusion, but will certainly make a note of every type I counter from now on and add up to this thread time to time. Apart from conclusion, faulty reasoning questions also have some major types of faulty conclusions (Post hoc ergo propter hoc, cum hoc ergo propter hoc, argumentum ad hominem etc etc ). here is a list of common fallacious conclusions I got from Lsatblog. I am pasting them here.

List of common logical fallacies compiled by Steve Schwartz - ManhattanLSAT from http://lsatblog.blogspot.com/

1. Ice cream sales increase in the summer. Violent crime also increases in the summer.
Therefore, ice cream causes violent crime.
-Assumes that correlation means causation. However, there is a third variable here -the increased temperature in the summertime, which causes both ice cream sales and violent crime to increase.

2. Before women got the vote, there were no nuclear weapons. Therefore, women’s suffrage led to the development of nuclear weapons.
-"Post hoc ergo propter hoc" fallacy. Believes that just because one thing came before another means that the first thing caused the second thing.

3. “I can’t believe you attended that protest. Why don’t you support our country?”
-Assumes more than is warranted. Attending a protest does not necessarily mean that you don't support the country.

4. You get cancer and seek treatment. With health being your only concern, you decide
to go the hospital that has the highest cancer patient survival rates.
-While this sounds good at first, think about what kind of hospital would have the highest cancer patient survival rates. While this could mean it's a great hospital, it might also mean the hospital is receiving the easiest, most straightforward cases. The most skilled doctors want a challenge, so they go to hospitals specializing in more difficult and rare forms of cancer. People with difficult cases seek out these doctors. As such, these doctors will have lower cancer patient survival rates even though they are better doctors.

Dave: "Of course you would say that, you're a record company executive."
-"Ad hominem." Dave attacks a personal characteristic of Bill, rather than addressing Bill's position.

6. My teacher said that I had to read the textbook if I wanted to pass the exam. I have
read the textbook, so I will definitely pass the exam.
-Confuses necessary and sufficient conditions. If you pass the exam, it means you read the textbook, but reading the textbook is not enough to pass the exam. You must understand what's in the textbook, be able to write well, show up to the exam, etc.

7. Oil spills are always caused by hull breaches. Therefore, if oil tankers are reinforced
with double hulls, oil spills will decrease.
-"System effect." This does address the cause of the hull breaches, which would make you think that oil spills will decrease. However, once the sailors know the tanker is reinforced with double hulls, they might sail the ship more recklessly, which can lead to more hull breaches and oil spills.

8. If Robert Moses hadn’t built all those roads and bridges in New York City, traffic
congestion today would be even worse.
-Building all the roads and bridges makes it easier for traffic to get to NYC. Also, someone else might have built them instead.

9. Before every major revolution, a country experiences economic decline. Therefore,
-Confuses necessary and sufficient conditions. If we have a revolution, we know economic decline came before it. However, economic decline can occur without a revolution following it.

10. "I’ll only believe in evolution when a monkey gives birth to a human."
-"Straw man" argument. Sets an unreasonably high burden of proof and misrepresents the theory of evolution.

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Re: Types of Conclusion on CR [#permalink]

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10 Sep 2011, 03:46
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Thanks AJ85! This is quite helpful! +1

Also, I would like to share the two different types of logical reasoning used in CR questions (I just made the summaries for myself so wanted to share).

There are two categories of questions on CR and RC that require different modes of thinking – Inductive reasoning and Deductive reasoning:

1. Real-world reasoning questions (Inductive):

a. Specific instance to general conclusions
b. Allows real-world common-sense assumptions
c. Conclusion can be false even if all premises are true because this reasoning involves a logical leap in order to state a general conclusion from a specific instance.
d. Example: In a survey, 4 out of 5 people said that X is crazy. Therefore, 80% of entire population thinks X is crazy (weak induction).
Examples of questions on RC: Main Idea, Purpose, Structure; on CR: Strengthen, Weaken

2. Formal logic questions (Deductive):

a. General statements to specific conclusions
b. Does NOT allow any assumptions
c. Conclusion must be true based on given premises to be a valid conclusion. NO additional assumptions allowed. Conclusion can be valid or invalid (derived properly from premises or not); sound or unsound (premises are true or not) but can’t be false.
d. Example: All men are mortal. X is men. Therefore X is mortal.
Examples of questions on RC: Inference, According to…, Detail; on CR: Inference, Draw a conclusion, Must be true
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Re: Types of Conclusion on CR [#permalink]

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10 Sep 2011, 13:57
Vinay,

Great post and thx for sharing your experience with cr and rc questions. Yes I agree with you. I believe though formal logic is not directly tested on gmat , the underlying principle of most conclusion questions is formal logic only. whenever you bring even little of outside info in a conclusion or evaluate or assumption question you stand 100 % chance of getting the question wrong. Also most of inference questions on RC passages too limit the scope of questions to what is implied in passage. strong language/ extreme language or even u real world general truths result in wrong answer choices most of the time.

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Re: Types of Conclusion on CR [#permalink]

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