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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. 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
2 roles played by assumptions
the unless equation (conditional reasoning)
3 quirks of assumption question answer choices
Family #4: Disprove
2. 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
Time shift errors
Family #4: Disprove
Family #3: Hurt
Survey errors
3. 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
False analogy
2 speaker questions
Exceptional case/over generalization
How to approach causality and strengthen questions?
4. If the stimulus contains an argument - determine whether the argument is strong or weak.
Appeal Fallacies
Primary Objective #3
Solving Parallel Reasoning questions in the order stated
Rules for Family #2
5. 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
Assumptions and conditionality: the two types of answer choices normally produced are?
False analogy
Primary Objective #2
Mistaken Negation
6. 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
Necessary Condition
Numbers and percentages Common misconceptions
Time shift errors
Common weakening scenarios
7. 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
Internal contradiction AKA self contradiction
Assumptions and conditionality: the two types of answer choices normally produced are?
Family #3: Hurt
Rules for Family #2
8. 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.
2 speaker questions
Central assumption of causal conclusions
Words used to introduce cause and effect relationships. (memorize)
Justify the conclusion formula
9. 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
Main Point Questions
How to solve Justify questions mechanistically
Errors in the use of evidence
Causal statements
10. 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
3 logical features of conditional reasoning
Family #4: Disprove
Words used to introduce a sufficient condition
Conclusion Indicators
11. Stimulus (affected or determined)--/-> answer choices (accepted) Negative sign on the arrow reflects attacking or hurting the argument (weaken).
Family #3: Hurt
3 logical features of conditional reasoning
3 incorrect answer traps (weaken)
Fundamental rules for strengthen - justify the conclusion and assumption questions
12. 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
Sufficient Condition
Uncertain use of a term or concept
Weakening conditional reasoning
Words used to introduce cause and effect relationships. (memorize)
13. 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
Appeal Fallacies
Counter Premise Indicators
Primary Objective #9
Primary Objective #7
14. 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
Quantity indicators
Premise definition
Strengthen questions ask you to identify the answer choice that best supports the argument. 2 common features
15. 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
Time shift errors
LSAT Conclusion trick for Method AP questions
How to attack a causal conclusion
16. 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
Conclusion definition
General lack of relevant evidence for the conclusion
Family #3: Hurt
17. Assumes that only 2 courses of action are available when there may be others. n
False dilemma
the unless equation (conditional reasoning)
Justify the conclusion formula
How to determine the strength of an argument
18. 1. Opposite answers. These answers do the exact opposite of What is needed. 2. Shell game answers. Occurs when an idea or concept is raised in the stimulus and then a very similar idea appears in the answer choices - but the idea is changed just enou
How to strengthen an argument
Time shift errors
3 incorrect answer traps (weaken)
Method of Reasoning questions
19. 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
Central assumption of causal conclusions
Words used to introduce a sufficient condition
How to attack a causal conclusion
False analogy
20. 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?
Counter Premise Indicators
2 speaker questions
What is the biggest reason students miss questions?
Conclusion definition
21. 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
Primary Objective #8
Assumptions and conditionality: the two types of answer choices normally produced are?
'Additional' Premise Indicators
22. 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
Rules for Family #2
Fundamental rules for strengthen - justify the conclusion and assumption questions
General lack of relevant evidence for the conclusion
23. 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
Numbers and percentages Common misconceptions
Fundamental rules for strengthen - justify the conclusion and assumption questions
Exceptional case/over generalization
Necessary Condition
24. 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
Internal contradiction AKA self contradiction
Weakening conditional reasoning
Method of Reasoning
LSAT Definition of 'either/or'
25. 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
Probability indicators
Central assumption of causal conclusions
How to attack a causal conclusion
Straw Man
26. 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
What to do when a stimulus that contains conditional reasoning is combined with a must be true question stem
How to identify Justify the Conclusion questions
Sufficient Condition
27. 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
Fact test for Method of Reasoning questions
Quantity indicators
Words used to introduce a sufficient condition
28. 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 #3
Family #2: Help
Mistaken Reversal
the unless equation (conditional reasoning)
29. 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 solve Justify questions mechanistically
Assumptions and conditionality: the two types of answer choices normally produced are?
Mistaken Reversal
Numbers and percentages Common misconceptions
30. To logically negate a conditional statement - negate the necessary condition. Example: neither...nor becomes either...or.
Logical negation
How to strengthen an argument
Weakening conditional reasoning
Family #3: Hurt
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
Weaken question signal words
Uncertain use of a term or concept
Primary Objective #6
32. Stimulus (accepted) --/-> answer choices (affected or determined) cannot be true.
Primary Objective #3
Family #4: Disprove
Common weakening scenarios
Necessary Condition
33. 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
How to determine the strength of an argument
Primary Objective #1
Family #2: Help
34. 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+.
Mistaken Reversal
LSAT Definition of 'either/or'
Method of Reasoning questions
Words used to introduce a necessary condition
35. Prephrase: after reading the question stem - take a moment to mentally formulate your answer to the question stem.
Mistaken Negation
Conclusion Identification Method
Primary Objective #6
Rules for Family #3
36. Occurs when an author improperly equates a percentage with a definate quantity or vice versa. n
Solving Parallel Reasoning questions in the order stated
LSAT Definition of 'either/or'
How to identify Justify the Conclusion questions
Numbers and percentage errors
37. 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
Words used to introduce a sufficient condition
Solving Parallel Reasoning questions in the order stated
LSAT Definition of 'either/or'
General lack of relevant evidence for the conclusion
38. 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
Primary Objective #9
Mistaken Negation
Exceptional case/over generalization
Mistaken cause and effect
39. Occurs when the author uses an analogy that is two disimilar to the original situation to be applicable. n
How to attack a causal conclusion
False analogy
the unless equation (conditional reasoning)
Counter Premise Indicators
40. 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
the unless equation (conditional reasoning)
Fact test for Method of Reasoning questions
Mistaken Reversal
Appeal Fallacies
41. Occurs when an author makes conflicting statements. n
Primary Objective #2
Words used to introduce cause and effect relationships. (memorize)
Internal contradiction AKA self contradiction
Common weakening scenarios
42. 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
Logical negation
Primary Objective #5
Rules for Family #1
Fact test for Method of Reasoning questions
43. Carefully read and identify the question stem. DO NOT assume that certain words are automatically associated with certain questions types.
Typical assumption question stems
Primary Objective #5
Words used to introduce cause and effect relationships. (memorize)
'Additional' Premise Indicators
44. Percent - proportion - fraction - ratio - incidence - likelihood - probability - segment - share. n
Family #1: Prove
3 quirks of assumption question answer choices
the unless equation (conditional reasoning)
Words used to introduce percentage ideas
45. 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
Prephrasing Method of Reasoning questions
Primary Objective #6
Conclusion Identification Method
46. 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
General lack of relevant evidence for the conclusion
Method of Reasoning questions
Premise definition
Things to remember in regards to WEAKEN questions
47. 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.
Logical opposites
Probability indicators
Family #4: Disprove
Conclusion Indicators
48. 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
One of the most commonly used stimulus structures is what? How are they recognized?
Assumptions and conditionality: the two types of answer choices normally produced are?
3 logical features of conditional reasoning
Circular reasoning
49. 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
Words used to introduce numerical ideas
Words used to introduce percentage ideas
Rules for Family #3
50. 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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