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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. 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
LSAT Definition of 'either/or'
Numbers and percentage errors
Errors in the use of evidence
Source argument AKA ad hominen
2. 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 -
Family #2: Help
Words used to introduce cause and effect relationships. (memorize)
Words used to introduce a necessary condition
Probability indicators
3. If the stimulus contains an argument - identify the conclusion. If the stimulus contains a fact set - examine each fact.
Method of Reasoning questions
What to do when a stimulus that contains conditional reasoning is combined with a must be true question stem
Rules for Family #1
Primary Objective #2
4. 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
Conclusion Identification Method
Incorrect answers in Point at Issue questions
3 quirks of assumption question answer choices
Primary Objective #7
5. 1. The stem uses the word assumption - presupposition or some variation 2. The stem NEVER uses the word 'if' or any other sufficient condition indicator. The stem will likely contain a necessary condition indicator such as required or unless. The cor
Weaken question signal words
LSAT Definition of 'either/or'
Family #4: Disprove
Typical assumption question stems
6. 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
2 roles played by assumptions
What to do when a stimulus that contains conditional reasoning is combined with a must be true question stem
Method of Reasoning questions
Method of Reasoning
7. At least on of the two - possibly both.
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8. 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
Probability indicators
Premise Indicators
How to approach causality and strengthen questions?
Method of Reasoning
9. 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 #3
Causal statements
Rules for Family #1
What to do when a stimulus that contains conditional reasoning is combined with a must be true question stem
10. Assumes that only 2 courses of action are available when there may be others. n
Family #2: Help
False dilemma
Time shift errors
Words used to introduce percentage ideas
11. 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
2 roles played by assumptions
Primary Objective #9
Primary Objective #5
Circular reasoning
12. Stimulus (affected or determined)--/-> answer choices (accepted) Negative sign on the arrow reflects attacking or hurting the argument (weaken).
Common weakening scenarios
Mistaken Negation
Family #3: Hurt
False analogy
13. 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
Family #3: Hurt
Time shift errors
Mistaken cause and effect
Numbers and percentages Common misconceptions
14. Occurs when the author uses an analogy that is two disimilar to the original situation to be applicable. n
Primary Objective #1
Conclusion Indicators
False analogy
Incorrect answers in Point at Issue questions
15. 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
Things to remember in regards to WEAKEN questions
Errors of conditional reasoning
Premise Indicators
Primary Objective #4
16. 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 incorrect answer traps (weaken)
Words used to introduce cause and effect relationships. (memorize)
Incorrect answers in Point at Issue questions
Assumptions and causality: typical correct answer categories
17. An event or circumstance whose occurrence is required in order for a sufficient condition to occur.
How to attack a causal conclusion
Necessary Condition
Primary Objective #8
Primary Objective #7
18. 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
Incorrect Method of Reasoning answers
3 logical features of conditional reasoning
Premise Indicators
Errors of composition and division
19. Premises + answer choice = conclusion When approaching answers - separate them into winners and losers - then apply the justify formula.
Assumptions and conditionality: the two types of answer choices normally produced are?
Family #4: Disprove
Justify the conclusion formula
Central assumption of causal conclusions
20. Carefully read and identify the question stem. DO NOT assume that certain words are automatically associated with certain questions types.
Primary Objective #8
Common features of Resolve the Paradox
Primary Objective #5
Resolve the Paradox question stem features
21. A statement or judgement that follows from one or more reasons. Ask: What is the author driving at? What does the author want me to believe? What point follows from the others?
LSAT Definition of 'either/or'
Conclusion definition
Prephrasing Method of Reasoning questions
Justify the conclusion formula
22. 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
Weaken question signal words
2 roles played by assumptions
Justify the conclusion formula
How to identify Justify the Conclusion questions
23. Switches the elements in the sufficient and necessary conditions - creating a statement that does not have to be true. Given: A+ --> Study Mistaken Reversal: Study --> A+.
Rules for Family #1
Mistaken Reversal
Appeal Fallacies
Circular reasoning
24. 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
Mistaken Negation
What to do when a stimulus that contains conditional reasoning is combined with a must be true question stem
How to strengthen an argument
Appeal Fallacies
25. Immediately look for the repeat or contrapositive in the answer choices. Avoid mistaken reversals and mistaken negations.
2 speaker questions
Primary Objective #9
What to do when a stimulus that contains conditional reasoning is combined with a must be true question stem
Family #1: Prove
26. 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
2 roles played by assumptions
Appeal Fallacies
Things to remember in regards to WEAKEN questions
Primary Objective #4
27. 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
Assumptions and conditionality: the two types of answer choices normally produced are?
Fundamental rules for strengthen - justify the conclusion and assumption questions
Uncertain use of a term or concept
Exceptional case/over generalization
28. 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.
Words used to introduce a sufficient condition
Fundamental rules for strengthen - justify the conclusion and assumption questions
What is the biggest reason students miss questions?
Family #4: Disprove
29. If the stimulus contains an argument - determine whether the argument is strong or weak.
Assumptions and conditionality: the two types of answer choices normally produced are?
Primary Objective #3
Words used to introduce percentage ideas
Primary Objective #2
30. Amount - quantity - sum - total - count - tally.n
Family #3: Hurt
3 incorrect answer traps (weaken)
Words used to introduce numerical ideas
'Additional' Premise Indicators
31. 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
Necessary Condition
LSAT Conclusion trick for Method AP questions
Rules for Family #3
Incorrect Method of Reasoning answers
32. 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.
Circular reasoning
Mistaken cause and effect
Family #4: Disprove
Premise Indicators
33. Occurs when an author improperly equates a percentage with a definate quantity or vice versa. n
Common weakening scenarios
Premise Indicators
What to do when a stimulus that contains conditional reasoning is combined with a must be true question stem
Numbers and percentage errors
34. Then - only - only if - must - required - unless - except - until - without.
Source argument AKA ad hominen
Circular reasoning
Sufficient Condition
Words used to introduce a necessary condition
35. 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
Weakening conditional reasoning
the unless equation (conditional reasoning)
Source argument AKA ad hominen
Primary Objective #2
36. 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.
Common weakening scenarios
Primary Objective #7
Assumptions and causality: typical correct answer categories
Mistaken Reversal
37. 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
Words used to introduce numerical ideas
'Additional' Premise Indicators
38. 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
Primary Objective #6
Primary Objective #9
Primary Objective #3
Causal statements
39. 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
Words used to introduce percentage ideas
Time shift errors
Counter Premise Indicators
Appeal Fallacies
40. If - when - whenever - every - all - any - people who - in order to.
Conclusion definition
Source argument AKA ad hominen
Central assumption of causal conclusions
Words used to introduce a sufficient condition
41. 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
Assumptions and conditionality: the two types of answer choices normally produced are?
Rules for Family #3
Primary Objective #6
Primary Objective #9
42. Stimulus (accepted) --/-> answer choices (affected or determined) cannot be true.
Family #4: Disprove
Assumptions and conditionality: the two types of answer choices normally produced are?
Circular reasoning
Primary Objective #1
43. Read closely and know precisely what the author said. DO NOT GENERALIZE!.
Weakening conditional reasoning
3 quirks of assumption question answer choices
Primary Objective #4
General lack of relevant evidence for the conclusion
44. 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
Family #3: Hurt
LSAT Conclusion trick for Method AP questions
Main Point Questions
Premise definition
45. 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
One of the most commonly used stimulus structures is what? How are they recognized?
Rules for Family #3
Rules for Family #1
Things to remember in regards to WEAKEN questions
46. 1. The survey uses a biased sample 2. The survey questions are improperly constructed 3. Respondents to the survey give inaccurate responses. People do not always tell the truth when responding to surveys.n
Survey errors
Necessary Condition
One of the most commonly used stimulus structures is what? How are they recognized?
Family #1: Prove
47. 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
Fact test for Method of Reasoning questions
Words used to introduce percentage ideas
Weakening conditional reasoning
48. 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
Words used to introduce percentage ideas
LSAT Conclusion trick for Method AP questions
Solving Parallel Reasoning questions in the order stated
Mistaken cause and effect
49. Percent - proportion - fraction - ratio - incidence - likelihood - probability - segment - share. n
Primary Objective #6
Weaken question signal words
Words used to introduce percentage ideas
Quantity indicators
50. 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.
Words used to introduce numerical ideas
Words used to introduce a necessary condition
Logical opposites
Conclusion definition