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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. 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
Things to remember in regards to WEAKEN questions
Conclusion Indicators
Uncertain use of a term or concept
Premise Indicators
2. 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
Conclusion Indicators
Premise Indicators
Incorrect answers in Point at Issue questions
Time shift errors
3. Premises + answer choice = conclusion When approaching answers - separate them into winners and losers - then apply the justify formula.
Survey errors
Justify the conclusion formula
Strengthen questions ask you to identify the answer choice that best supports the argument. 2 common features
Rules for Family #2
4. 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
Family #2: Help
Mistaken Reversal
How to solve Justify questions mechanistically
Conclusion Identification Method
5. 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
Incorrect answers in Point at Issue questions
Solving Parallel Reasoning questions in the order stated
Main Point Questions
6. 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
Incorrect Method of Reasoning answers
Central assumption of causal conclusions
Errors of conditional reasoning
How to identify Justify the Conclusion questions
7. Prephrase: after reading the question stem - take a moment to mentally formulate your answer to the question stem.
Mistaken Negation
Primary Objective #6
Mistaken cause and effect
2 roles played by assumptions
8. If all 5 answer choices appear to be 'losers' - return to the stimulus and re-evaluate the argument.
False analogy
Primary Objective #9
Conclusion Identification Method
Things to remember in regards to WEAKEN questions
9. 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
Fundamental rules for strengthen - justify the conclusion and assumption questions
Uncertain use of a term or concept
Family #3: Hurt
Errors of composition and division
10. Read closely and know precisely what the author said. DO NOT GENERALIZE!.
Assumptions and conditionality: the two types of answer choices normally produced are?
False dilemma
Primary Objective #4
Family #4: Disprove
11. 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?
What is the biggest reason students miss questions?
How to attack a causal conclusion
Conclusion definition
Weaken question signal words
12. 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
Assumptions and causality: typical correct answer categories
2 speaker questions
Rules for Family #3
Quantity indicators
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
2 roles played by assumptions
Weakening conditional reasoning
Words used to introduce a necessary condition
General lack of relevant evidence for the conclusion
14. If - when - whenever - every - all - any - people who - in order to.
Words used to introduce a sufficient condition
Mistaken Reversal
Prephrasing Method of Reasoning questions
Primary Objective #7
15. Negates both conditions - creating a statement that does not have to be true. Given: A+ --> Study Mistaken Negation: Not A+ --> Not Study
Mistaken Negation
Premise Indicators
Primary Objective #1
Survey errors
16. 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?
Rules for Family #2
How to determine the strength of an argument
Premise definition
Weakening conditional reasoning
17. 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 #9
Quantity indicators
Rules for Family #1
Weakening conditional reasoning
18. 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 #2
How to attack a causal conclusion
False analogy
Errors of composition and division
19. 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
Words used to introduce cause and effect relationships. (memorize)
the unless equation (conditional reasoning)
Primary Objective #6
Rules for Family #2
20. 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
How to solve Justify questions mechanistically
Errors of conditional reasoning
Quantity indicators
21. If the stimulus contains an argument - identify the conclusion. If the stimulus contains a fact set - examine each fact.
Primary Objective #7
Primary Objective #2
False analogy
Words used to introduce percentage ideas
22. 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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23. 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.
Resolve the Paradox question stem features
Premise Indicators
Central assumption of causal conclusions
Method of Reasoning
24. If the stimulus contains an argument - determine whether the argument is strong or weak.
Incorrect answers in Point at Issue questions
Assumptions and causality: typical correct answer categories
3 incorrect answer traps (weaken)
Primary Objective #3
25. 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
Premise definition
Circular reasoning
Resolve the Paradox question stem features
Incorrect answers in Point at Issue questions
26. 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
Internal contradiction AKA self contradiction
Causal statements
Primary Objective #3
Assumption Negation Technique
27. 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
Errors of conditional reasoning
Words used to introduce a necessary condition
How to attack a causal conclusion
Fact test for Method of Reasoning questions
28. Stimulus (affected or determined) ---> answer choices (accepted) AKA: Help Family assumption - justify the conclusion - strengthen/support - resolve the paradox.
Counter Premise Indicators
Family #2: Help
Solving Parallel Reasoning questions in the order stated
Primary Objective #6
29. Stimulus (affected or determined)--/-> answer choices (accepted) Negative sign on the arrow reflects attacking or hurting the argument (weaken).
Rules for Family #3
3 logical features of conditional reasoning
Strengthen questions ask you to identify the answer choice that best supports the argument. 2 common features
Family #3: Hurt
30. 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 -
Primary Objective #1
Words used to introduce percentage ideas
Probability indicators
Primary Objective #3
31. 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
Typical assumption question stems
One of the most commonly used stimulus structures is what? How are they recognized?
Numbers and percentages Common misconceptions
Family #3: Hurt
32. 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
Prephrasing Method of Reasoning questions
Premise Indicators
Numbers and percentages Common misconceptions
Words used to introduce a necessary condition
33. An event or circumstance whose occurrence is required in order for a sufficient condition to occur.
Assumptions and conditionality: the two types of answer choices normally produced are?
Words used to introduce a sufficient condition
Necessary Condition
2 roles played by assumptions
34. 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 #1: Prove
3 logical features of conditional reasoning
Causal statements
Weakening conditional reasoning
35. 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
Common weakening scenarios
Rules for Family #3
2 speaker questions
Sufficient Condition
36. 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
Things to remember in regards to WEAKEN questions
Solving Parallel Reasoning questions in the order stated
2 roles played by assumptions
37. Assumes that only 2 courses of action are available when there may be others. n
Primary Objective #6
Survey errors
False dilemma
LSAT Definition of 'either/or'
38. Weaken - attack - undermine - refute - argue against - call into question - cast doubt - challenge - damage - counter - When evaluating answers ask yourself: 'Would this answer choice make the author reconsider his position or force the author to res
Primary Objective #1
How to approach causality and strengthen questions?
Weaken question signal words
Necessary Condition
39. 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
Time shift errors
Primary Objective #4
Primary Objective #9
40. 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
How to identify Justify the Conclusion questions
Source argument AKA ad hominen
Time shift errors
Mistaken Negation
41. An event or circumstance whose occurrence indicates that a necessary condition must also occur.
Sufficient Condition
Common features of Resolve the Paradox
Counter Premise Indicators
Central assumption of causal conclusions
42. 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
Primary Objective #3
LSAT Definition of 'either/or'
Words used to introduce numerical ideas
43. 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
Rules for Family #2
Premise definition
Survey errors
Primary Objective #9
44. 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
Common weakening scenarios
Central assumption of causal conclusions
Solving Parallel Reasoning questions in the order stated
Primary Objective #6
45. Then - only - only if - must - required - unless - except - until - without.
'Additional' Premise Indicators
Words used to introduce a necessary condition
2 speaker questions
Primary Objective #9
46. At least on of the two - possibly both.
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47. 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
Resolve the Paradox question stem features
3 quirks of assumption question answer choices
How to determine the strength of an argument
48. 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
Numbers and percentages Common misconceptions
Family #4: Disprove
Primary Objective #6
49. 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
Counter Premise Indicators
Family #3: Hurt
Family #1: Prove
Sufficient Condition
50. 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
Method of Reasoning questions
False analogy
How to strengthen an argument
Family #4: Disprove