to the top

#24 - If a society encourages freedom of thought and

Clay Cooper
PowerScore Staff
PowerScore Staff
 
Posts: 243
Joined: Fri Jul 03, 2015 3:30 pm
Points: 103

Hi LSATconqueror,

Thanks for your question, and welcome to the forum!

I will diagram the stimulus and the correct answer choice. Stimulus first:

Premise:

Encourage free thought and expression :arrow: Creativity flourishes

Conclusion:

Creativity flourished :arrow: encouraged free thought and expression.

This is mistaken reversal - it is not logically valid just to reverse the two elements; if we want to find the contrapositive, we must both reverse and negate them.

Correct answer (E):

Premise:

democratic :arrow: citizens' opinions meaningful

Conclusion:

~citizens' opinions meaningful :arrow: ~democratic

This reasoning, by contrast, is valid; the conditional elements are both reversed and negated, and thus the conclusion is the contrapositive of the premise. Because the reasoning is valid, the answer choice does NOT parallel the flawed reasoning of the argument in the stimulus, and this is the correct answer.

I hope that helps.
jgray
LSAT Leader
 
Posts: 45
Joined: Fri Feb 13, 2015 10:20 am
Points: 28

Understand that CF was necessary in the first sentence.
In the second sentence.... how do we determine if the US Creativity or the 18th is the necessary condition? What indicators am I missing?
Kristina Moen
PowerScore Staff
PowerScore Staff
 
Posts: 231
Joined: Thu Nov 17, 2016 11:19 pm
Points: 227

Hi jgray,

The closest I can come to a Conditional Reasoning Indicator in the 2nd sentence is "In the...". This is similar to the construction "People who..." or "When...", which indicates a sufficient condition. You can think "When this happens, then that happens." So here, it is during the US in the 18th century that creativity flourished. The first part is the sufficient and the second part is necessary. You can diagram this as U.S. in 18th century :arrow: creativity flourished.

I'll give you another example. "In the United States, elections are held in November." This means that IF it's November in the United States, THEN we are having an election. The contrapositive is that if there's no election, it's not November in United States. But we could have multiple elections throughout the year and other course countries have elections, so you can't infer if there's an election, it's November in the US.

Hope that helps!
co659
LSAT Apprentice
 
Posts: 10
Joined: Sun Apr 23, 2017 11:22 am
Points: 10

Hello ! I only selected E because all the other choices failed, not because I understood what was being said. The jumbling of the words confused me. I used Ernst and, reading through the explanations here that (E) was the correct choice because it was the contrapositive:

D = democracy
M.E = meaningful effect on the govt.

D :arrow: M.E.
CP: M/E :arrow: /D

I'm confused how the rest of the statement is the contrapositive - does "because" act like "since" and introduce the sufficient?? That's the only way I've been able to make sense of this
Jonathan Evans
PowerScore Staff
PowerScore Staff
 
Posts: 681
Joined: Thu Jun 09, 2016 2:12 pm
Points: 570
Location: DFW, Texas

Hi, co659,

Good question. Let's see whether we can parse this out to make it more coherent.

Start with the stimulus. Identify the conclusion:
    Freedom of thought was encouraged. (We'll call this F)

Now let's take a look at the premises:
  1. If society encourages freedom of thought and expression, then creativity flourishes. (F & E :arrow: C)
  2. Creativity flourished. (C)

To summarize:
  1. F & E :arrow: C
  2. C
    Conclusion: F

Notice that we have made a Mistaken Reversal™. We have taken a necessary condition (C) to be sufficient for (F).

We need to find the answer choice that DOES NOT contain this error. Let's parse out Answer Choice (E):
  1. If democratic, then opinions matter. (D :arrow: O)
  2. Opinions don't matter. (O)
    Conclusion: These societies aren't democratic. (D)

This argument is valid. The negation of the necessary condition O implies that the sufficient condition D cannot occur. In other words, answer choice (E) uses the contrapositive to prove its conclusion.

I hope this helps!
Blueballoon5%
LSAT Master
 
Posts: 160
Joined: Mon Jul 13, 2015 1:22 am
Points: 127

I need help diagramming answer choice B. The answer key states, “We can conclude that the Hillside police department has improved its efficiency, because crime rates are down in Hillside, and it is an established fact that the crime rates go down when police departments increase their efficiency.”

I think the first part of this sentence is diagrammed as: “crimes rates down in Hillside :arrow: police improved its efficiency.” I am guessing this is correct, but I am not sure because the word “conclude” is not listed in the lesson book as a necessary condition indicator and the word “because” is not listed as a sufficient condition indicator. If these are not sufficient/necessary condition indicators, how else could we get to the correct conditional statement?
(Note: for the second part, I was able to diagram correctly because “when” is a sufficient condition indicator”)

Hope you can help! Thanks!! :)
Claire Horan
PowerScore Staff
PowerScore Staff
 
Posts: 310
Joined: Mon Apr 18, 2016 3:03 pm
Points: 237

Hi BlueBalloon,

Here is my diagram for answer choice (B):

Conclusion: The Hillside police department has improved its efficiency.
Premise #1: Crime rates are down in Hillside.
Premise #2: Police departments increase their efficiency :arrow: crime rates go down

Because the premises only lead to the conclusion if you reverse it so say "crime rates go down :arrow: increase efficiency," this answer choice employs a mistake reversal, just as the other incorrect answer choices do. (This is a parallel flaw-EXCEPT question.)

From reading your question, it seems like you may be assuming conditional relationships where they aren't. An assertion that something IS the case is not a conditional. Neither Premise #1 or the Conclusion are conditionals. Premise #2 is a conditional because it describes a relationship between two conditions without telling us on its own whether either condition IS actually satisfied. In other words, a conditional relationship cannot tell us anything by itself about what is actually happening. It can only tell us what will happen if a particular condition is present.

On the LSAT, you may see arguments like the one above with a conditional premise, a factual assertion that a condition is or is not occurring, and a conclusion about what is or is not actually happening.

You will also see arguments that contain a conditional premise, another conditional premise, and a conclusion that connects them into a chain. The conclusion will tell you more about the relationships between the conditions, but it will not tell you another about what is actually happening. Be careful not to get confused between these two types of arguments!

And since much of this is difficult to explain without seeing what questions you have, I would encourage you to call the Homework Hotline if anything in this post is unclear. Good luck!
marchibold
LSAT Novice
 
Posts: 1
Joined: Wed Jun 12, 2019 8:56 pm
Points: 1

Hello,

Could someone explain to me why question number 13 (error of reasoning) of L2 HW answer is E? I thought that A was more appropriate but E is the correct answer.

Thanks!
Stephanie Turaj
PowerScore Staff
PowerScore Staff
 
Posts: 259
Joined: Mon Jan 11, 2016 11:02 am
Points: 328

LSATconqueror wrote:How would you diagram this question? Any help will be greatly appreciated.


Hi LSATconqueror!

Thanks for the post. I'm assuming you were referencing #13 on page 2-72 in your LSAT Course Book. I have moved your question to the post explaining that topic! Let me know if this helps, or if you were referencing another question!

Thanks!