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Test your basic knowledge |
LSAT Logical Reasoning Clues
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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. 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
Straw Man
Primary Objective #5
Errors in the use of evidence
Assumptions and causality: typical correct answer categories
2. 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
2 speaker questions
Necessary Condition
Errors of composition and division
3. 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
3 incorrect answer traps (weaken)
Central assumption of causal conclusions
Incorrect Method of Reasoning answers
Family #4: Disprove
4. 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
Circular reasoning
Sufficient Condition
Fundamental rules for strengthen - justify the conclusion and assumption questions
2 roles played by assumptions
5. 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.
Premise Indicators
Logical opposites
Family #3: Hurt
Assumptions and causality: typical correct answer categories
6. 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
Logical opposites
Necessary Condition
Errors of composition and division
7. 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
Incorrect answers in Point at Issue questions
Fact test for Method of Reasoning questions
Primary Objective #2
8. 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
Source argument AKA ad hominen
Weaken question signal words
3 quirks of assumption question answer choices
LSAT Conclusion trick for Method AP questions
9. 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
3 logical features of conditional reasoning
Primary Objective #5
Common weakening scenarios
10. 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
What to do when a stimulus that contains conditional reasoning is combined with a must be true question stem
Quantity indicators
Conclusion Identification Method
Mistaken Reversal
11. 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.
How to determine the strength of an argument
Circular reasoning
Words used to introduce cause and effect relationships. (memorize)
LSAT Definition of 'either/or'
12. 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
Weakening conditional reasoning
2 speaker questions
Primary Objective #1
13. 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
Words used to introduce numerical ideas
Common weakening scenarios
Errors of conditional reasoning
Time shift errors
14. If - when - whenever - every - all - any - people who - in order to.
Survey errors
Numbers and percentages Common misconceptions
Words used to introduce a sufficient condition
Exceptional case/over generalization
15. 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
How to strengthen an argument
Typical assumption question stems
Primary Objective #3
Things to remember in regards to WEAKEN questions
16. 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
Numbers and percentages Common misconceptions
Numbers and percentage errors
Premise Indicators
Errors of conditional reasoning
17. Stimulus (affected or determined) ---> answer choices (accepted) AKA: Help Family assumption - justify the conclusion - strengthen/support - resolve the paradox.
Words used to introduce numerical ideas
Source argument AKA ad hominen
Family #2: Help
Words used to introduce a necessary condition
18. 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
Weaken question signal words
Words used to introduce percentage ideas
Main Point Questions
Rules for Family #3
19. 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.
Words used to introduce percentage ideas
LSAT Definition of 'either/or'
Internal contradiction AKA self contradiction
Premise Indicators
20. Prephrase: after reading the question stem - take a moment to mentally formulate your answer to the question stem.
Primary Objective #8
Primary Objective #3
Primary Objective #6
Prephrasing Method of Reasoning questions
21. 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
Things to remember in regards to WEAKEN questions
Common features of Resolve the Paradox
Mistaken cause and effect
Strengthen questions ask you to identify the answer choice that best supports the argument. 2 common features
22. 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
3 incorrect answer traps (weaken)
Things to remember in regards to WEAKEN questions
Circular reasoning
Necessary Condition
23. 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.
Primary Objective #7
Family #4: Disprove
Assumption Negation Technique
Numbers and percentages Common misconceptions
24. 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
Words used to introduce cause and effect relationships. (memorize)
Conclusion Indicators
Words used to introduce numerical ideas
25. 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
Internal contradiction AKA self contradiction
Uncertain use of a term or concept
Fact test for Method of Reasoning questions
Logical negation
26. 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
Things to remember in regards to WEAKEN questions
Family #3: Hurt
Prephrasing Method of Reasoning questions
2 speaker questions
27. 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
Mistaken Negation
Things to remember in regards to WEAKEN questions
2 speaker questions
28. 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
Uncertain use of a term or concept
Logical negation
Primary Objective #5
29. 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
One of the most commonly used stimulus structures is what? How are they recognized?
Errors of composition and division
Rules for Family #2
How to approach causality and strengthen questions?
30. 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
False dilemma
Survey errors
Causal statements
Numbers and percentage errors
31. Stimulus (affected or determined)--/-> answer choices (accepted) Negative sign on the arrow reflects attacking or hurting the argument (weaken).
Prephrasing Method of Reasoning questions
Family #3: Hurt
Uncertain use of a term or concept
Rules for Family #2
32. 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
Mistaken Reversal
Rules for Family #3
Incorrect answers in Point at Issue questions
Method of Reasoning
33. 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 attack a causal conclusion
Mistaken cause and effect
Family #2: Help
Premise definition
34. 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
Assumptions and conditionality: the two types of answer choices normally produced are?
Quantity indicators
Primary Objective #7
35. 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.
Primary Objective #1
2 speaker questions
Errors of composition and division
the unless equation (conditional reasoning)
36. 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
Words used to introduce percentage ideas
LSAT Definition of 'either/or'
Circular reasoning
37. Stimulus (accepted) --/-> answer choices (affected or determined) cannot be true.
Assumption Negation Technique
Justify the conclusion formula
Family #4: Disprove
'Additional' Premise Indicators
38. 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
Primary Objective #8
Time shift errors
2 speaker questions
Errors of composition and division
39. Occurs when the author uses an analogy that is two disimilar to the original situation to be applicable. n
Sufficient Condition
False analogy
Method of Reasoning
Source argument AKA ad hominen
40. 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
Central assumption of causal conclusions
Primary Objective #8
3 logical features of conditional reasoning
Mistaken cause and effect
41. To logically negate a conditional statement - negate the necessary condition. Example: neither...nor becomes either...or.
Assumptions and conditionality: the two types of answer choices normally produced are?
Numbers and percentages Common misconceptions
Logical negation
Things to remember in regards to WEAKEN questions
42. 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
Source argument AKA ad hominen
Primary Objective #8
Method of Reasoning questions
Primary Objective #1
43. 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
Sufficient Condition
Resolve the Paradox question stem features
Incorrect answers in Point at Issue questions
Errors of conditional reasoning
44. If all 5 answer choices appear to be 'losers' - return to the stimulus and re-evaluate the argument.
3 incorrect answer traps (weaken)
Mistaken Reversal
False analogy
Primary Objective #9
45. 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
Primary Objective #9
Errors of composition and division
Fundamental rules for strengthen - justify the conclusion and assumption questions
46. Immediately look for the repeat or contrapositive in the answer choices. Avoid mistaken reversals and mistaken negations.
Survey errors
Assumptions and causality: typical correct answer categories
What to do when a stimulus that contains conditional reasoning is combined with a must be true question stem
2 speaker questions
47. 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
Weakening conditional reasoning
How to strengthen an argument
Premise Indicators
48. 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
2 speaker questions
How to identify Justify the Conclusion questions
Premise definition
Fact test for Method of Reasoning questions
49. 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
Time shift errors
How to approach causality and strengthen questions?
Things to remember in regards to WEAKEN questions
General lack of relevant evidence for the conclusion
50. 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
Assumption Negation Technique
Primary Objective #8
Resolve the Paradox question stem features
Numbers and percentages Common misconceptions
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