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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. Occurs when an author improperly equates a percentage with a definate quantity or vice versa. n
the unless equation (conditional reasoning)
Primary Objective #7
Prephrasing Method of Reasoning questions
Numbers and percentage errors
2. 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
Weakening conditional reasoning
Typical assumption question stems
Justify the conclusion formula
3. 1. Incomplete info. The author fails to consider all of the possibilities or relies upon evidence that is incomplete. This flaw can be attacked by bringing up new possibilities or info. 2. Improper comparison. The author attempts to compare two or mo
Common weakening scenarios
Strengthen questions ask you to identify the answer choice that best supports the argument. 2 common features
Central assumption of causal conclusions
'Additional' Premise Indicators
4. First Family The correct answer choice will be a rephrasing of the main conclusion of the argument. The conclusion is either in the middle or beginning of the stimulus. The correct answer choice must not only be true it also must summarize the author
Method of Reasoning questions
2 roles played by assumptions
Main Point Questions
Words used to introduce a sufficient condition
5. 1. The sufficient condition does not make the necessary condition occur. That is - the sufficient condition does not actively cause the necessary condition to happen. 2. Temporally speaking - either condition can occur first - or the two conditions c
3 logical features of conditional reasoning
Incorrect answers in Point at Issue questions
'Additional' Premise Indicators
Mistaken cause and effect
6. If - when - whenever - every - all - any - people who - in order to.
Causal statements
Words used to introduce a sufficient condition
How to attack a causal conclusion
Words used to introduce percentage ideas
7. If the stimulus contains an argument - determine whether the argument is strong or weak.
Appeal Fallacies
Primary Objective #3
Solving Parallel Reasoning questions in the order stated
Family #1: Prove
8. Then - only - only if - must - required - unless - except - until - without.
How to approach causality and strengthen questions?
Family #1: Prove
Words used to introduce a necessary condition
Common weakening scenarios
9. Determine whether the stimulus contains an argument or if it is only a set of factual statements. MUST recognize whether a conclusion is present.
Errors of conditional reasoning
Sufficient Condition
One of the most commonly used stimulus structures is what? How are they recognized?
Primary Objective #1
10. 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
Strengthen questions ask you to identify the answer choice that best supports the argument. 2 common features
How to approach causality and strengthen questions?
Mistaken Reversal
Rules for Family #1
11. An event or circumstance whose occurrence is required in order for a sufficient condition to occur.
Uncertain use of a term or concept
Incorrect answers in Point at Issue questions
Necessary Condition
Prephrasing Method of Reasoning questions
12. To logically negate a conditional statement - negate the necessary condition. Example: neither...nor becomes either...or.
Resolve the Paradox question stem features
Premise Indicators
Main Point Questions
Logical negation
13. Always ask: Do the given facts support the conclusion? Do the premises strongly suggest that the conclusion would be true? Does the conclusion feel like an inevitable result of the premises? Or Does the conclusion go beyond the scope of the info in t
How to determine the strength of an argument
Family #4: Disprove
Primary Objective #2
Words used to introduce numerical ideas
14. 1. No conclusion. When a stimulus does not have a conclusion and contains a paradox - expect a Resolve question 2. Language of contradiction exp: but - however - yet - although - paradoxically - surprisingly.
3 quirks of assumption question answer choices
Family #2: Help
Common features of Resolve the Paradox
Exceptional case/over generalization
15. 1. The stem uses the word strengthen or a synonym (support - helps - most justifies) 2. The stem indicates that you should accept the answer choices are true.
Common weakening scenarios
Strengthen questions ask you to identify the answer choice that best supports the argument. 2 common features
Fact test for Method of Reasoning questions
Logical opposites
16. Mistaken negation and reversal exp: taking the non-existence of something as evidence that a necessary precondition for that thing also did not exist' (MN) 'mistakes being sufficient to justify punishment for being required to justify it' (MR)n
Errors of conditional reasoning
How to approach causality and strengthen questions?
Weakening conditional reasoning
Numbers and percentages Common misconceptions
17. 1. Whatever term is modified by 'unless' - 'except' - 'until' or 'without' becomes the necessary condition 2. The remaining term is negated and becomes the sufficient condition.
the unless equation (conditional reasoning)
Justify the conclusion formula
Mistaken Reversal
Method of Reasoning
18. 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
Words used to introduce percentage ideas
Incorrect Method of Reasoning answers
Exceptional case/over generalization
How to approach causality and strengthen questions?
19. Usually have one male and one female. The female uses sound reasoning and the male uses flawed reasoning or makes a mistake. This is not always true - but more often than not.n
Strengthen questions ask you to identify the answer choice that best supports the argument. 2 common features
LSAT Conclusion trick for Method AP questions
2 speaker questions
Primary Objective #8
20. 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.
Assumptions and conditionality: the two types of answer choices normally produced are?
Premise Indicators
Weaken question signal words
the unless equation (conditional reasoning)
21. 1. if you recognize the form of reasoning used in the stimulus (causal - conditional - etc.) immediately attack the answers and search for the answer with similar reasoning (analogy - circular reasoning) 2. The Conclusion - match the conclusions - to
General lack of relevant evidence for the conclusion
Solving Parallel Reasoning questions in the order stated
Appeal Fallacies
Source argument AKA ad hominen
22. Separate the answer choices into 'contenders' and 'loser'. After completing this process - review the contenders and decide which answer correct.
Primary Objective #8
Assumptions and causality: typical correct answer categories
2 speaker questions
Errors of composition and division
23. 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
Assumption Negation Technique
Assumptions and causality: typical correct answer categories
Incorrect Method of Reasoning answers
Straw Man
24. 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
3 incorrect answer traps (weaken)
Weaken question signal words
Appeal Fallacies
Sufficient Condition
25. 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.
Typical assumption question stems
Logical opposites
General lack of relevant evidence for the conclusion
Fundamental rules for strengthen - justify the conclusion and assumption questions
26. Authors misuses info to such a degree that they fail to provide any info to support their conclusion or they provide info that is irrelevant to their conclusion. n
Prephrasing Method of Reasoning questions
How to solve Justify questions mechanistically
General lack of relevant evidence for the conclusion
Words used to introduce cause and effect relationships. (memorize)
27. 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?
How to determine the strength of an argument
Time shift errors
Resolve the Paradox question stem features
Premise definition
28. 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
Primary Objective #4
Family #3: Hurt
How to identify Justify the Conclusion questions
Weakening conditional reasoning
29. Refer to the amount or quantity in the relationship. Examples: (do not need to memorize) all - every - most - many - several - sole - only - not all - none - few.
Quantity indicators
Conclusion definition
How to approach causality and strengthen questions?
Primary Objective #6
30. Occurs when an author makes conflicting statements. n
Family #4: Disprove
Strengthen questions ask you to identify the answer choice that best supports the argument. 2 common features
Internal contradiction AKA self contradiction
Exceptional case/over generalization
31. 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
Weaken question signal words
Circular reasoning
Resolve the Paradox question stem features
Mistaken cause and effect
32. Read closely and know precisely what the author said. DO NOT GENERALIZE!.
Primary Objective #4
Primary Objective #6
Justify the conclusion formula
Primary Objective #1
33. 1. Increasing percentages automatically lead to increasing numbers. This is not necessarily true because the overall size of the group could get smaller. 2. Decreasing percentages automatically lead to decreasing numbers 3. Increasing numbers automat
Logical negation
Numbers and percentages Common misconceptions
Errors of composition and division
Primary Objective #7
34. At least on of the two - possibly both.
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35. As an argument progresses - the author must use each term in a constant - coherent fashion. using a term in different ways is inherently confusing and undermines the integrity of the argument. n
Probability indicators
Uncertain use of a term or concept
Conclusion definition
Straw Man
36. 1. The stimulus will almost always contain an argument you must identify - isolate and assess the premises and the conclusion of the argument 2. Focus on the conclusion. Almost all correct answer choices impact the conclusion 3. The info in the stimu
Justify the conclusion formula
Typical assumption question stems
Time shift errors
Fundamental rules for strengthen - justify the conclusion and assumption questions
37. Introduce something that actually contains an idea that is counter to the argument. By raising opposition - the author can minimize the damage that would be done by the objection if it were raised elsewhere. but yet - however - on the other hand - ad
Primary Objective #9
Necessary Condition
Primary Objective #8
Counter Premise Indicators
38. 1. You can use only the info in the stimulus to prove the correct answer choice 2. Any answer choice that describes an element or a situation that does not occur in the stimulus is incorrect Method of Reasoning questions use a variety of formats - bu
Central assumption of causal conclusions
Rules for Family #2
Method of Reasoning questions
False analogy
39. Assumes that only 2 courses of action are available when there may be others. n
'Additional' Premise Indicators
False dilemma
Words used to introduce numerical ideas
Quantity indicators
40. Occurs when the author uses an analogy that is two disimilar to the original situation to be applicable. n
False analogy
Logical negation
LSAT Definition of 'either/or'
How to solve Justify questions mechanistically
41. 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
LSAT Conclusion trick for Method AP questions
How to strengthen an argument
Fundamental rules for strengthen - justify the conclusion and assumption questions
Incorrect Method of Reasoning answers
42. 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
Weakening conditional reasoning
Incorrect Method of Reasoning answers
Strengthen questions ask you to identify the answer choice that best supports the argument. 2 common features
Weaken question signal words
43. 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
Appeal Fallacies
Fundamental rules for strengthen - justify the conclusion and assumption questions
Mistaken cause and effect
How to solve Justify questions mechanistically
44. 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
Exceptional case/over generalization
3 logical features of conditional reasoning
Straw Man
Internal contradiction AKA self contradiction
45. 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
Prephrasing Method of Reasoning questions
Words used to introduce cause and effect relationships. (memorize)
Weaken question signal words
Causal statements
46. Argument Part - If you do see the main conclusion at the end of a Method-AP problem - be prepared to answer a question about a part of the arguement other than the conclusion.n
Method of Reasoning
Central assumption of causal conclusions
Mistaken cause and effect
Words used to introduce a sufficient condition
47. 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
Common features of Resolve the Paradox
Uncertain use of a term or concept
3 incorrect answer traps (weaken)
Prephrasing Method of Reasoning questions
48. 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
3 incorrect answer traps (weaken)
Rules for Family #3
Mistaken cause and effect
Family #2: Help
49. If all 5 answer choices appear to be 'losers' - return to the stimulus and re-evaluate the argument.
Common features of Resolve the Paradox
Typical assumption question stems
Method of Reasoning questions
Primary Objective #9
50. 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
Things to remember in regards to WEAKEN questions
Rules for Family #2
Errors of composition and division
LSAT Conclusion trick for Method AP questions