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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. To logically negate a conditional statement - negate the necessary condition. Example: neither...nor becomes either...or.
2 roles played by assumptions
Logical negation
Numbers and percentage errors
Method of Reasoning
2. Occurs when the author uses an analogy that is two disimilar to the original situation to be applicable. n
False analogy
Family #4: Disprove
Quantity indicators
Assumptions and causality: typical correct answer categories
3. Take the statements under consideration and place them in an arrangement that forces once to be the conclusion and the other(s) to be the premise (s). Use premise and conclusion indicators to achieve this end. Once the pieces are arranged - determine
Internal contradiction AKA self contradiction
Method of Reasoning
Conclusion Identification Method
LSAT Definition of 'either/or'
4. 1. The info in the stimulus is suspect. There are often reasoning errors present and depending on the question - you will help shore up the argument in some way. 2. The answer choices are accepted as given - even if they include 'new' info. Your task
General lack of relevant evidence for the conclusion
Family #3: Hurt
Rules for Family #2
Weakening conditional reasoning
5. Premises + answer choice = conclusion When approaching answers - separate them into winners and losers - then apply the justify formula.
Logical opposites
Words used to introduce a necessary condition
Primary Objective #5
Justify the conclusion formula
6. 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 -
How to solve Justify questions mechanistically
Probability indicators
2 speaker questions
Rules for Family #1
7. 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.
Common features of Resolve the Paradox
Errors of conditional reasoning
Words used to introduce numerical ideas
Justify the conclusion formula
8. Determine whether the stimulus contains an argument or if it is only a set of factual statements. MUST recognize whether a conclusion is present.
LSAT Conclusion trick for Method AP questions
Primary Objective #8
Primary Objective #1
Primary Objective #4
9. 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
Primary Objective #3
How to approach causality and strengthen questions?
Premise definition
Probability indicators
10. 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
Premise Indicators
Appeal Fallacies
Family #4: Disprove
How to determine the strength of an argument
11. 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
Conclusion definition
General lack of relevant evidence for the conclusion
How to strengthen an argument
Causal statements
12. If - when - whenever - every - all - any - people who - in order to.
Sufficient Condition
Causal statements
How to determine the strength of an argument
Words used to introduce a sufficient condition
13. 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
Central assumption of causal conclusions
Premise Indicators
Justify the conclusion formula
3 incorrect answer traps (weaken)
14. A. Eliminates an alternate cause for the stated effect B. Shows that when the cause occurs - the effect occurs - assumption answers affirm the cause/effect relationship C. Show that when the cause does not occur - the effect doe not occur D. Eliminat
Logical opposites
Exceptional case/over generalization
Assumptions and causality: typical correct answer categories
Family #3: Hurt
15. 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
Numbers and percentage errors
Causal statements
Primary Objective #5
2 speaker questions
16. An event or circumstance whose occurrence indicates that a necessary condition must also occur.
How to determine the strength of an argument
Assumption Negation Technique
What is the biggest reason students miss questions?
Sufficient Condition
17. 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
Uncertain use of a term or concept
Fact test for Method of Reasoning questions
2 speaker questions
Primary Objective #9
18. 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.
3 quirks of assumption question answer choices
3 logical features of conditional reasoning
Words used to introduce cause and effect relationships. (memorize)
Survey errors
19. 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
Rules for Family #1
2 speaker questions
Mistaken cause and effect
Mistaken Negation
20. 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
How to attack a causal conclusion
Typical assumption question stems
Circular reasoning
Rules for Family #2
21. If the stimulus contains an argument - determine whether the argument is strong or weak.
Primary Objective #8
General lack of relevant evidence for the conclusion
Words used to introduce a sufficient condition
Primary Objective #3
22. 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
Prephrasing Method of Reasoning questions
Fact test for Method of Reasoning questions
Mistaken Reversal
23. 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
Central assumption of causal conclusions
Words used to introduce percentage ideas
Solving Parallel Reasoning questions in the order stated
Weakening conditional reasoning
24. 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
How to solve Justify questions mechanistically
Method of Reasoning questions
Fact test for Method of Reasoning questions
Numbers and percentages Common misconceptions
25. The mistake involves assuming that conditions will remain constant over time - and that what was the case in the past will be the case in the future or present. n
Time shift errors
Mistaken Negation
LSAT Conclusion trick for Method AP questions
Source argument AKA ad hominen
26. Stimulus (affected or determined)--/-> answer choices (accepted) Negative sign on the arrow reflects attacking or hurting the argument (weaken).
How to identify Justify the Conclusion questions
Numbers and percentage errors
Logical negation
Family #3: Hurt
27. 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
Logical negation
Words used to introduce a sufficient condition
How to determine the strength of an argument
Solving Parallel Reasoning questions in the order stated
28. 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
Method of Reasoning questions
False analogy
Primary Objective #8
Exceptional case/over generalization
29. Used to introduce other premises that support the conclusion but are sometimes non-essential to the conclusion furthermore - moreover - besides - in addition - whats more - after all.
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30. 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
Things to remember in regards to WEAKEN questions
Errors in the use of evidence
3 logical features of conditional reasoning
31. 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.
Primary Objective #4
Words used to introduce percentage ideas
Strengthen questions ask you to identify the answer choice that best supports the argument. 2 common features
Logical negation
32. 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
2 roles played by assumptions
Prephrasing Method of Reasoning questions
Primary Objective #7
Mistaken Negation
33. Amount - quantity - sum - total - count - tally.n
Family #4: Disprove
Probability indicators
Words used to introduce numerical ideas
Words used to introduce percentage ideas
34. 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
Justify the conclusion formula
Logical opposites
Uncertain use of a term or concept
35. 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
Errors in the use of evidence
Main Point Questions
Exceptional case/over generalization
Common weakening scenarios
36. They h ave failed to fully and accurately identify the conclusion of the argument. If a conclusion is present - you MUST identify it prior to proceeding on to the question stem.
What is the biggest reason students miss questions?
How to identify Justify the Conclusion questions
How to attack a causal conclusion
Internal contradiction AKA self contradiction
37. Occurs when an author improperly equates a percentage with a definate quantity or vice versa. n
2 speaker questions
Numbers and percentage errors
Words used to introduce numerical ideas
Errors of conditional reasoning
38. 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?
Conclusion Indicators
Justify the conclusion formula
Premise definition
Words used to introduce percentage ideas
39. 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.
False analogy
How to solve Justify questions mechanistically
Logical opposites
3 incorrect answer traps (weaken)
40. 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.
How to determine the strength of an argument
the unless equation (conditional reasoning)
Errors in the use of evidence
Premise Indicators
41. Stimulus (accepted) --/-> answer choices (affected or determined) cannot be true.
Necessary Condition
Family #4: Disprove
Quantity indicators
Primary Objective #1
42. 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 #3
One of the most commonly used stimulus structures is what? How are they recognized?
Mistaken Negation
Exceptional case/over generalization
43. Prephrase: after reading the question stem - take a moment to mentally formulate your answer to the question stem.
Primary Objective #6
Time shift errors
What to do when a stimulus that contains conditional reasoning is combined with a must be true question stem
Primary Objective #7
44. 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.
Family #1: Prove
Primary Objective #2
Weaken question signal words
Words used to introduce cause and effect relationships. (memorize)
45. 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
General lack of relevant evidence for the conclusion
Conclusion Identification Method
Assumptions and conditionality: the two types of answer choices normally produced are?
46. Carefully read and identify the question stem. DO NOT assume that certain words are automatically associated with certain questions types.
Primary Objective #5
How to identify Justify the Conclusion questions
False dilemma
Time shift errors
47. Stimulus (affected or determined) ---> answer choices (accepted) AKA: Help Family assumption - justify the conclusion - strengthen/support - resolve the paradox.
Mistaken Reversal
Source argument AKA ad hominen
Family #2: Help
How to identify Justify the Conclusion questions
48. 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
Exceptional case/over generalization
Probability indicators
Prephrasing Method of Reasoning questions
Method of Reasoning
49. 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
Mistaken cause and effect
Exceptional case/over generalization
Resolve the Paradox question stem features
Fundamental rules for strengthen - justify the conclusion and assumption questions
50. 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
False dilemma
Circular reasoning
Errors of composition and division
Survey errors