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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.
Survey errors
LSAT Definition of 'either/or'
Primary Objective #6
Things to remember in regards to WEAKEN questions
2. 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.
Words used to introduce cause and effect relationships. (memorize)
Family #1: Prove
Errors of conditional reasoning
Mistaken cause and effect
3. Amount - quantity - sum - total - count - tally.n
How to approach causality and strengthen questions?
Resolve the Paradox question stem features
Central assumption of causal conclusions
Words used to introduce numerical ideas
4. Thus - therefore - hence - consequently - as a result - so - accordingly - clearly - must be that - shows that - conclude that - follows that - for this reason.
Logical opposites
Conclusion Indicators
Incorrect Method of Reasoning answers
Conclusion Identification Method
5. If the stimulus contains an argument - determine whether the argument is strong or weak.
Primary Objective #3
Things to remember in regards to WEAKEN questions
Premise definition
Primary Objective #6
6. 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
Exceptional case/over generalization
Counter Premise Indicators
Causal statements
What is the biggest reason students miss questions?
7. 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
Mistaken Reversal
Family #4: Disprove
Family #1: Prove
8. 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
Internal contradiction AKA self contradiction
How to strengthen an argument
Method of Reasoning questions
Common weakening scenarios
9. Occurs when the author uses an analogy that is two disimilar to the original situation to be applicable. n
Rules for Family #2
False analogy
Probability indicators
the unless equation (conditional reasoning)
10. 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
Rules for Family #2
Numbers and percentage errors
Necessary Condition
Fact test for Method of Reasoning questions
11. 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
Solving Parallel Reasoning questions in the order stated
How to identify Justify the Conclusion questions
Primary Objective #8
LSAT Definition of 'either/or'
12. 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
How to determine the strength of an argument
Probability indicators
Circular reasoning
How to solve Justify questions mechanistically
13. 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
Primary Objective #6
General lack of relevant evidence for the conclusion
Appeal Fallacies
Assumptions and conditionality: the two types of answer choices normally produced are?
14. If - when - whenever - every - all - any - people who - in order to.
Words used to introduce a sufficient condition
Errors in the use of evidence
Conclusion Indicators
Rules for Family #3
15. Determine whether the stimulus contains an argument or if it is only a set of factual statements. MUST recognize whether a conclusion is present.
Method of Reasoning questions
Quantity indicators
Primary Objective #3
Primary Objective #1
16. 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
Conclusion Indicators
Mistaken cause and effect
Central assumption of causal conclusions
Errors in the use of evidence
17. 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.
Mistaken Negation
One of the most commonly used stimulus structures is what? How are they recognized?
Primary Objective #7
Justify the conclusion formula
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
What is the biggest reason students miss questions?
Primary Objective #1
Errors of composition and division
Incorrect Method of Reasoning answers
19. Then - only - only if - must - required - unless - except - until - without.
Fundamental rules for strengthen - justify the conclusion and assumption questions
Words used to introduce a necessary condition
Method of Reasoning
Rules for Family #3
20. 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
Family #2: Help
Rules for Family #3
Weakening conditional reasoning
21. 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
Rules for Family #2
Internal contradiction AKA self contradiction
What to do when a stimulus that contains conditional reasoning is combined with a must be true question stem
Straw Man
22. An event or circumstance whose occurrence is required in order for a sufficient condition to occur.
Assumptions and causality: typical correct answer categories
Necessary Condition
Premise definition
How to strengthen an argument
23. 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 -
Sufficient Condition
Probability indicators
Conclusion Indicators
Primary Objective #3
24. 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?
Central assumption of causal conclusions
Causal statements
Premise definition
Primary Objective #3
25. 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
Rules for Family #2
Primary Objective #1
Method of Reasoning questions
Mistaken Negation
26. 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
How to strengthen an argument
One of the most commonly used stimulus structures is what? How are they recognized?
2 roles played by assumptions
Incorrect Method of Reasoning answers
27. 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
Resolve the Paradox question stem features
Words used to introduce numerical ideas
Primary Objective #1
Main Point Questions
28. Premises + answer choice = conclusion When approaching answers - separate them into winners and losers - then apply the justify formula.
False analogy
Words used to introduce numerical ideas
Words used to introduce a necessary condition
Justify the conclusion formula
29. 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
Fact test for Method of Reasoning questions
How to attack a causal conclusion
Circular reasoning
30. 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
What to do when a stimulus that contains conditional reasoning is combined with a must be true question stem
Causal statements
False analogy
How to attack a causal conclusion
31. 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)
What is the biggest reason students miss questions?
Common features of Resolve the Paradox
Weaken question signal words
32. 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
Circular reasoning
Logical negation
Words used to introduce a necessary condition
Fundamental rules for strengthen - justify the conclusion and assumption questions
33. 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
Errors of composition and division
Rules for Family #2
Assumptions and causality: typical correct answer categories
Sufficient Condition
34. 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
3 quirks of assumption question answer choices
Method of Reasoning
Things to remember in regards to WEAKEN questions
Exceptional case/over generalization
35. Stimulus (affected or determined) ---> answer choices (accepted) AKA: Help Family assumption - justify the conclusion - strengthen/support - resolve the paradox.
Family #2: Help
Common features of Resolve the Paradox
Resolve the Paradox question stem features
How to strengthen an argument
36. 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
Assumption Negation Technique
Weakening conditional reasoning
Causal statements
Family #1: Prove
37. Stimulus (accepted) --/-> answer choices (affected or determined) cannot be true.
Family #1: Prove
Family #4: Disprove
How to determine the strength of an argument
2 roles played by assumptions
38. 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
Primary Objective #4
Rules for Family #1
Method of Reasoning questions
Resolve the Paradox question stem features
39. 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
General lack of relevant evidence for the conclusion
Circular reasoning
How to determine the strength of an argument
Words used to introduce percentage ideas
40. 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
Words used to introduce a necessary condition
Mistaken cause and effect
Time shift errors
Assumptions and conditionality: the two types of answer choices normally produced are?
41. 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
Fact test for Method of Reasoning questions
Justify the conclusion formula
Rules for Family #3
42. 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
LSAT Conclusion trick for Method AP questions
Straw Man
Rules for Family #1
Resolve the Paradox question stem features
43. 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
Errors in the use of evidence
Causal statements
Common features of Resolve the Paradox
2 speaker questions
44. 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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45. 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.
LSAT Conclusion trick for Method AP questions
Common features of Resolve the Paradox
Primary Objective #3
Rules for Family #3
46. Stimulus (affected or determined)--/-> answer choices (accepted) Negative sign on the arrow reflects attacking or hurting the argument (weaken).
Numbers and percentage errors
Family #3: Hurt
Assumption Negation Technique
Quantity indicators
47. 1. The info in the stimulus is supect. There are often reasoning errors present - and you will further weaken the argument in some way. 2. The answer choices are accepted as given - even if they include 'new' info. The task is to determine which answ
Rules for Family #3
How to strengthen an argument
Primary Objective #4
Words used to introduce a sufficient condition
48. Assumes that only 2 courses of action are available when there may be others. n
Errors of conditional reasoning
False dilemma
Conclusion definition
Premise Indicators
49. 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
Circular reasoning
Prephrasing Method of Reasoning questions
Family #2: Help
Errors of composition and division
50. 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
Rules for Family #3
How to approach causality and strengthen questions?
Incorrect Method of Reasoning answers