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Test your basic knowledge |
LSAT Logical Reasoning Clues
Start Test
Study First
Subjects
:
logic-and-reasoning
,
LSAT
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Prephrase: after reading the question stem - take a moment to mentally formulate your answer to the question stem.
How to determine the strength of an argument
Primary Objective #6
Justify the conclusion formula
Necessary Condition
2. Think about the structure of the argument before examining the answer choices. Do not expect to see the exact prephrase - there are too many variations. Make an abstract prephrase then examine each answer to see if it paraphrases the prephrase.n
What to do when a stimulus that contains conditional reasoning is combined with a must be true question stem
Words used to introduce percentage ideas
'Additional' Premise Indicators
Prephrasing Method of Reasoning questions
3. 1. new element answers - an answer that describes something that did not occure or describes an element new to the argument cannot be correct 2. Half right - half wrong answers - LSAT makers like to start off with something that happened - then end w
False dilemma
Incorrect Method of Reasoning answers
Rules for Family #3
What to do when a stimulus that contains conditional reasoning is combined with a must be true question stem
4. Supporter - the traditional linking role - where an assumption connects pieces of the argument. (often new or rogue pieces) They also can close gaps. Ex: All male citizens of athens had the right to vote. Therefore - Socrates had the right to vote in
the unless equation (conditional reasoning)
False analogy
Solving Parallel Reasoning questions in the order stated
2 roles played by assumptions
5. The author assumes as true What is supposed to be proved. exp: 'this essay is the best because it is better than all the others'n
Method of Reasoning
3 quirks of assumption question answer choices
Circular reasoning
Counter Premise Indicators
6. Takes a small number of intstances and treats those instances as if they support a broad - sweeping conclusion. Often appears as an incorrect answer.n
Main Point Questions
Family #2: Help
Fact test for Method of Reasoning questions
Exceptional case/over generalization
7. A fact - proposition or statement from which a conclusion is made. Ask: What reasons has the author used to persuade me? Why should I believe this argument? What evidence exists?
Justify the conclusion formula
Probability indicators
3 logical features of conditional reasoning
Premise definition
8. An event or circumstance whose occurrence indicates that a necessary condition must also occur.
Sufficient Condition
Primary Objective #8
Weakening conditional reasoning
Rules for Family #2
9. If an answer choice describes an event that did not occur in the stimulus - then that answer is incorrect. Watch for answers that are partially true - that is answers that contain a description of something that happened in the argument but that also
Fact test for Method of Reasoning questions
Conclusion Indicators
Method of Reasoning
Conclusion Identification Method
10. Read closely and know precisely what the author said. DO NOT GENERALIZE!.
Primary Objective #4
Mistaken cause and effect
Family #3: Hurt
Things to remember in regards to WEAKEN questions
11. 1. Opposite answers. These answers do the exact opposite of What is needed. 2. Shell game answers. Occurs when an idea or concept is raised in the stimulus and then a very similar idea appears in the answer choices - but the idea is changed just enou
3 incorrect answer traps (weaken)
Rules for Family #3
Words used to introduce percentage ideas
How to attack a causal conclusion
12. Negates both conditions - creating a statement that does not have to be true. Given: A+ --> Study Mistaken Negation: Not A+ --> Not Study
Common features of Resolve the Paradox
Typical assumption question stems
Exceptional case/over generalization
Mistaken Negation
13. To weaken a conditional conclusion - attack the necessary condition by showing that the necessary condition does not need to occur in order for the sufficient condition to occur. With a combo of a conditional reasoning stimulus and a weaken question
Family #3: Hurt
2 roles played by assumptions
Weakening conditional reasoning
How to approach causality and strengthen questions?
14. Occurs when an author makes conflicting statements. n
Primary Objective #6
Primary Objective #2
Straw Man
Internal contradiction AKA self contradiction
15. To raise a viewpoint at the beginning of the stimulus and then disagree with it immediately thereafter. The stimulus often begins with: Some people claim... Some people propose... Many people believe... Some argue that... Some critics claim... Some s
Primary Objective #4
Family #3: Hurt
One of the most commonly used stimulus structures is what? How are they recognized?
Solving Parallel Reasoning questions in the order stated
16. This type of flawed argument attacks the person (or source) instead of the argument they advance. because the LSAT is concerned solely with argument forms - a speaker can never validly attack the character or motives or a person; instead - a speaker
Family #4: Disprove
Source argument AKA ad hominen
How to determine the strength of an argument
Incorrect Method of Reasoning answers
17. 1. Any 'new' element in the conclusion will appear in the correct answer. 2. Elements that are common to the conclusion and at least one premise normally do not appear in the correct answer. 3. Elements that appear in the premises but not the conclus
Method of Reasoning
3 incorrect answer traps (weaken)
How to solve Justify questions mechanistically
Words used to introduce percentage ideas
18. 1. Stem uses the word 'if' or another sufficient indicator 2. Stem uses the phrase 'allows the conclusion to be properly drawn' or 'enables the conclusion to be properly drawn'. 3. Stem does not lessen the degree of justification. Never uses 'most ju
How to identify Justify the Conclusion questions
Weakening conditional reasoning
the unless equation (conditional reasoning)
Premise definition
19. Assumes that only 2 courses of action are available when there may be others. n
Conclusion Indicators
Primary Objective #4
False dilemma
How to approach causality and strengthen questions?
20. Occurs when the author uses an analogy that is two disimilar to the original situation to be applicable. n
False analogy
Primary Objective #8
Exceptional case/over generalization
Family #1: Prove
21. Refer to the likelihood of occurence or the obligation present - as in 'The mayor should resign.' 'the law will never pass.' Examples: (do not need to memorize) must - will - always - not always - probably - likely - would - never - rarely - could -
Straw Man
Probability indicators
Primary Objective #6
Incorrect answers in Point at Issue questions
22. Premises + answer choice = conclusion When approaching answers - separate them into winners and losers - then apply the justify formula.
Fundamental rules for strengthen - justify the conclusion and assumption questions
Justify the conclusion formula
Survey errors
Errors of conditional reasoning
23. At least on of the two - possibly both.
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24. They can be in the premises or conclusion. If they are in the conclusion the argument is flawed. Classic mistaken cause and effect reasoning refers to occurences when a causal assertion is made in the conclusion or the conclusion presumes a causal re
Causal statements
Internal contradiction AKA self contradiction
Conclusion definition
Fact test for Method of Reasoning questions
25. Amount - quantity - sum - total - count - tally.n
Words used to introduce numerical ideas
Incorrect answers in Point at Issue questions
Rules for Family #1
Things to remember in regards to WEAKEN questions
26. The makers of the LSAT do not think that there are multiple causes for the same effect. When an LSAT speaker concludes that one occurance caused another - that speaker also assumes that the stated cause is the only possible cause of the effect and th
How to strengthen an argument
Mistaken Negation
Central assumption of causal conclusions
Rules for Family #2
27. Always read each of the five answer choices. If an answer choice appears somewhat attractive - interesting or even confusing - keep it as a contender and move to the next answer.
Primary Objective #7
the unless equation (conditional reasoning)
Rules for Family #1
2 speaker questions
28. Carefully read and identify the question stem. DO NOT assume that certain words are automatically associated with certain questions types.
Conclusion Identification Method
Appeal Fallacies
Primary Objective #5
Prephrasing Method of Reasoning questions
29. Separate the answer choices into 'contenders' and 'loser'. After completing this process - review the contenders and decide which answer correct.
Words used to introduce a sufficient condition
Assumption Negation Technique
Primary Objective #8
Sufficient Condition
30. Occurs when an author attempts to attack an opponent's position by ignoring the actual statements made by the opposing speaker and instead distorts and refashions the argument - making it weaker in the process. Often prephrased by 'what you're saying
Straw Man
Numbers and percentages Common misconceptions
Incorrect Method of Reasoning answers
Appeal Fallacies
31. Involves judgements made about groups and parts of a group. an error or composition occurs when the author attributes a characteristic of part of the group to the group as a whole or to each member of the group Error of division - author attributes c
Primary Objective #6
Fundamental rules for strengthen - justify the conclusion and assumption questions
General lack of relevant evidence for the conclusion
Errors of composition and division
32. Quantity: All = 100 Not all = 0-99 Some = 1-100 None = 0 Time: Always - Not always - Sometimes - Never Space: Everywhere - Not everywhere - Somewhere - No where.
Logical opposites
Family #3: Hurt
False analogy
3 quirks of assumption question answer choices
33. 1. assuming a causal relationship on the basis of the sequence of events 2. assuming a causal relationship when only a correlation exists 3. failure to consider an alternate cause for the effect or an alternate cause for both the cause and the effect
Numbers and percentages Common misconceptions
Weakening conditional reasoning
Fundamental rules for strengthen - justify the conclusion and assumption questions
Mistaken cause and effect
34. Mis-assessing the force of evidence is a frequent error committed by LSAT authors 1. Lack of evidence for a position is taken to prove that position is false 2. lack of evidence against a position is taken to prove that position is true 3. some evide
Errors in the use of evidence
'Additional' Premise Indicators
Source argument AKA ad hominen
Method of Reasoning
35. 1. Identify the conclusion - this is what you are trying to strengthen 2. Personalize the argument 3. Look for weaknesses in the argument 4. Arguments that contain analogies or use surveys rely upon the validity of those analogies and surveys. Answer
Prephrasing Method of Reasoning questions
Primary Objective #3
Conclusion definition
How to strengthen an argument
36. Caused by because of responsible for reason for leads to induced by promoted by determined by produced by product of played a role in was a factor in is an effect of.
LSAT Conclusion trick for Method AP questions
Premise Indicators
Words used to introduce cause and effect relationships. (memorize)
Causal statements
37. Allows you to decide between contenders or to confirm that the answer you have chosen is correct. 1. Logically negate the answer choices under consideration. Usually consists of taking a 'not' out of a sentence or putting a 'not' in a sentence. 2. Th
Conclusion Identification Method
False analogy
Rules for Family #3
Assumption Negation Technique
38. Stimulus (accepted) ----> Answer Choices (affected or determined) AKA: must be or prove family must be true - main point - point at issue - method of reasoning - flaw in the reasoning - parallel reasoning.
How to attack a causal conclusion
Central assumption of causal conclusions
Family #1: Prove
Time shift errors
39. Immediately look for the repeat or contrapositive in the answer choices. Avoid mistaken reversals and mistaken negations.
What to do when a stimulus that contains conditional reasoning is combined with a must be true question stem
How to strengthen an argument
Justify the conclusion formula
Errors in the use of evidence
40. They often feature 2 conclusions (main and sub.) - when the main conclusion is typically place in the first or second sentence and the last sentence contains the sub. conclusion. The sub. conclusion is set off by conclusion indicators while the main
Typical assumption question stems
How to attack a causal conclusion
LSAT Conclusion trick for Method AP questions
What to do when a stimulus that contains conditional reasoning is combined with a must be true question stem
41. A. Eliminate any alternate causes for the stated effect. B. Show that when the cause occurs - the effect occurs. C. Show that when the cause does not occur - the effect does not occur. D. Eliminate the possility that the stated relationship is revers
One of the most commonly used stimulus structures is what? How are they recognized?
How to approach causality and strengthen questions?
Internal contradiction AKA self contradiction
Conclusion Indicators
42. 1. If conditional statements are linked together in the argument - the correct answer choice for an assumption question will typically supply a missing link in the chain or the contrapositive to that link. 2. If you see a conditional conclusion and t
Straw Man
Conclusion definition
Incorrect answers in Point at Issue questions
Assumptions and conditionality: the two types of answer choices normally produced are?
43. 1. You must accept the stimulus info- even if it contains an error in reasoning-and use it to prove one of the answer choices must be true. 2. Any info in an answer choice that does not appear either directly in the stimulus or as a combination of it
Premise definition
Primary Objective #6
Assumptions and conditionality: the two types of answer choices normally produced are?
Rules for Family #1
44. 1. Stimulus will contain an argument. Must isolate and identify and assess the premises and the conclusion. 2. Focus on the conclusion. Almost all correct Weaken answers impact the conclusion. 3. The info in the stimulus is suspect. There are often r
Incorrect answers in Point at Issue questions
Errors of conditional reasoning
Probability indicators
Things to remember in regards to WEAKEN questions
45. Because - since - for - for example - for the reason that - in that - given that - as indicated by - due to - owing to - this can be seen from - we know this by.
Premise Indicators
Rules for Family #2
False dilemma
3 logical features of conditional reasoning
46. 1. Appeal to authority - uses the opinion of an authority in an attempt to persuade the reader. The flaw is that the authority may not have relevant knowledge or all of the info regarding the situation - to there may be a difference of opinion among
Appeal Fallacies
Words used to introduce numerical ideas
Rules for Family #1
Solving Parallel Reasoning questions in the order stated
47. 1. Watch for answers starting with the phrase 'at least one' or 'at least some'. When an assumption answer choice starts with one of these phrases it is usually right. But ALWAYS verify with A.N.T. 2. Avoid answers that claim an idea was the most imp
How to determine the strength of an argument
Sufficient Condition
Solving Parallel Reasoning questions in the order stated
3 quirks of assumption question answer choices
48. 1. ethical versus factual situations - when the stimulus addresses something ethical - a factual answer would be incorrect and vice versa 2. dual agreement or dual disagreement - often incorrect answer choices will supply statements that both speaker
Incorrect answers in Point at Issue questions
Primary Objective #8
Words used to introduce cause and effect relationships. (memorize)
Assumption Negation Technique
49. 1. An indication that the answer choices should be accepted as true 2. Keywords that indicate your task is to resolve the problem Action: Problem: Resolve Paradox Explain Contradiction Reconcile Discrepancy Conflict Puzzle *Attempt to prephrase Corre
Resolve the Paradox question stem features
Numbers and percentage errors
Family #4: Disprove
Straw Man
50. Whenever you identify a causal relationship in the conclusion of an LSAT problem - immediately prepare to either weaken or strengthen the argument. Tasks for Weaken questions...must always identify a causal conclusion. Then ask if there relationship
Logical negation
How to attack a causal conclusion
Resolve the Paradox question stem features
the unless equation (conditional reasoning)