Critical reasoning assumptions
59 flashcards covering Critical reasoning assumptions for the GMAT Verbal section.
Critical reasoning assumptions are the unstated beliefs or premises that form the foundation of an argument. They represent what must be true for the argument to hold, even if they're not explicitly mentioned. For instance, if an advertisement claims that a diet plan leads to weight loss, it might assume that users will follow it consistently and that no other factors interfere. Understanding these assumptions helps you evaluate the strength of arguments and spot potential flaws, which is essential for developing logical thinking skills tested in exams.
On the GMAT Verbal section, critical reasoning assumptions appear in questions that ask you to identify hidden assumptions, strengthen or weaken arguments, or evaluate conclusions. Common traps include overlooking subtle gaps in logic or mistaking correlation for causation, so focus on breaking down the argument's structure and questioning what evidence is missing. Mastering this topic can significantly boost your score by improving your ability to analyze complex passages quickly and accurately.
A concrete tip: Always identify the argument's core by asking, "What must be true for this to make sense?"
Terms (59)
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Assumption
In critical reasoning, an assumption is an unstated belief or premise that must be true for the argument's conclusion to hold, often bridging the gap between evidence and conclusion.
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Necessary Assumption
A necessary assumption is one that must be true for the argument to be valid; if it is false, the conclusion cannot follow from the premises.
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Sufficient Assumption
A sufficient assumption is one that, if true, would guarantee the argument's conclusion, making the argument logically sound on its own.
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Hidden Assumption
A hidden assumption is an implicit belief in an argument that is not directly stated but is required for the reasoning to work, often revealed through analysis.
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Unstated Premise
An unstated premise is an assumption that serves as a foundational element of the argument, without which the conclusion would not logically follow.
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Assumption in Arguments
Assumptions in arguments are the underlying connections between premises and conclusions that, if challenged, can weaken or strengthen the overall reasoning.
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Identifying Assumptions
Identifying assumptions involves looking for gaps in an argument where the evidence does not fully support the conclusion, requiring inference to fill those gaps.
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Necessary vs. Sufficient Assumptions
Necessary assumptions are essential for an argument's validity, while sufficient assumptions alone make the argument conclusive, helping distinguish question types on the GMAT.
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Causal Assumption
A causal assumption occurs when an argument assumes that one event causes another without evidence, such as implying correlation equals causation.
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Analogy Assumption
An analogy assumption is the belief that because two things are similar in some ways, they must be similar in the relevant ways, which can undermine an argument if the similarities are superficial.
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Sampling Assumption
A sampling assumption is the idea that a sample accurately represents the whole population, which can be flawed if the sample is biased or unrepresentative.
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Generalization Assumption
A generalization assumption occurs when an argument extends findings from a specific case to a broader group without justification, potentially leading to errors.
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Strengthening Assumptions
Strengthening assumptions involves finding statements that support or confirm the unstated premises in an argument, making the conclusion more likely.
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Weakening Assumptions
Weakening assumptions means identifying or providing evidence that challenges the unstated premises, thereby undermining the argument's conclusion.
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Negation Test for Assumptions
The negation test for assumptions checks if negating a statement destroys the argument, indicating it is a necessary assumption in critical reasoning.
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Common Traps in Assumptions
Common traps in assumptions include overlooking implicit biases, confusing correlation with causation, or accepting analogies without verifying their relevance.
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Assumption Questions on GMAT
Assumption questions on the GMAT require identifying the core unstated element that links premises to the conclusion, often asking to strengthen, weaken, or find the assumption.
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Flaw Related to Assumptions
A flaw related to assumptions is a logical error where the argument relies on an unjustified premise, such as assuming without evidence that an exception doesn't apply.
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Assumptions in Conclusions
Assumptions in conclusions are the implicit reasons that allow the argument to reach its final claim, often needing scrutiny to evaluate the argument's strength.
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Premises and Assumptions
Premises are stated facts in an argument, while assumptions are unstated ones; distinguishing them helps in analyzing how the argument is constructed.
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Counterexample to Assumption
A counterexample to an assumption is a scenario that shows the assumed premise is not always true, thereby weakening the argument.
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Evaluate Questions and Assumptions
Evaluate questions test assumptions by asking what information would help assess the argument's validity, focusing on potential flaws in unstated premises.
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Causal Chain Assumption
A causal chain assumption assumes a sequence of events where one leads to another without interruption, which can be disrupted by intervening factors.
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Scope Assumption
A scope assumption involves assuming that the argument's conditions apply more broadly than the evidence supports, such as generalizing from a limited study.
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Time-Based Assumption
A time-based assumption presumes that past trends will continue into the future without change, which can be invalidated by new circumstances.
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Expertise Assumption
An expertise assumption is the belief that an authority's opinion is correct in a specific context, potentially flawed if the expertise doesn't align with the topic.
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Quantity Assumption
A quantity assumption assumes that a certain amount or number is sufficient for the conclusion, like thinking a small sample proves a large claim.
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Quality Assumption
A quality assumption involves assuming that the characteristics of one thing apply equally to another, often leading to errors in comparisons.
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Assumption in Boldface Questions
In boldface questions, assumptions help identify the role of statements, such as whether they are premises, conclusions, or the assumptions linking them.
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Circular Reasoning Assumption
Circular reasoning assumption occurs when an argument assumes its own conclusion as a premise, making the reasoning tautological and unpersuasive.
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False Dilemma Assumption
A false dilemma assumption presents only two options when more exist, forcing the argument to rely on an oversimplified choice.
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Slippery Slope Assumption
A slippery slope assumption claims that a small action will lead to a series of escalating events without evidence, exaggerating potential outcomes.
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Ad Hominem and Assumptions
Ad hominem arguments assume that attacking the person invalidates their argument, which is a flawed assumption about relevance.
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Appeal to Authority Assumption
An appeal to authority assumption holds that an expert's statement is true solely because of their status, without verifying the context or evidence.
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Hasty Generalization
Hasty generalization is an assumption that draws a broad conclusion from insufficient evidence, a common pitfall in critical reasoning.
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Assumption in Inference Questions
In inference questions, assumptions are the logical bridges that allow drawing conclusions beyond what's directly stated.
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Challenging Assumptions
Challenging assumptions means questioning the unstated premises to test an argument's robustness, a key skill for GMAT critical reasoning.
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Assumptions in Evidence
Assumptions in evidence involve believing that the provided facts are complete and unbiased, which may not always be the case.
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Layered Assumptions
Layered assumptions are multiple unstated premises in a complex argument, each building on the previous one, requiring careful unpacking.
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Assumption Identification Strategy
An effective strategy for identifying assumptions is to ask what must be true for the conclusion to follow, then check for gaps.
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Predicting Assumptions
Predicting assumptions involves anticipating potential unstated premises before reviewing answer choices, improving efficiency on the GMAT.
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Example of Causal Assumption
For instance, an argument might assume that reducing advertising directly causes lower sales without considering other factors like market changes.
If a company cuts ads and sales drop, it assumes the cut caused the drop, ignoring alternatives.
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Example of Necessary Assumption
In an argument that a new policy will succeed because similar ones have, a necessary assumption is that conditions remain the same.
The policy's success assumes no external changes, like economic shifts.
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Example of Sufficient Assumption
A sufficient assumption might be that all competitors are eliminated, which alone would ensure market dominance.
If a company has no rivals, that assumption suffices to predict leadership.
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Trap of Overlooking Assumptions
A common trap is overlooking assumptions by focusing only on stated facts, leading to acceptance of flawed arguments.
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Assumption in Real-World Scenarios
In real-world scenarios on the GMAT, assumptions often involve economic or social contexts, like assuming consumer behavior remains constant.
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Advanced Assumption Analysis
Advanced analysis involves recognizing how multiple assumptions interact, such as in arguments with conditional statements or probabilities.
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Assumptions and Counterarguments
Assumptions can be targeted in counterarguments by providing evidence that contradicts the unstated premises, weakening the original claim.
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Quantifying Assumptions
Quantifying assumptions means assessing how strongly an assumption must hold, such as in arguments involving percentages or rates.
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Assumptions in Hypothetical Arguments
In hypothetical arguments, assumptions include believing that the hypothetical conditions accurately reflect possible realities.
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Refuting Assumptions
Refuting assumptions requires presenting evidence or logic that shows the unstated premise is unlikely or false.
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Assumptions in Parallel Reasoning
In parallel reasoning questions, assumptions help identify arguments with similar structures, including unstated links.
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Cultural Assumptions
Cultural assumptions are unstated beliefs based on societal norms, which can bias arguments if not examined.
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Temporal Assumptions
Temporal assumptions involve time frames, like assuming short-term trends predict long-term outcomes without justification.
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Assumptions in Data Interpretation
In data interpretation, assumptions include believing that the data is representative and accurately collected.
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Holistic Assumption Evaluation
Holistic evaluation of assumptions considers the entire argument's context, weighing all unstated elements together.
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Assumptions and Logical Fallacies
Assumptions often underlie logical fallacies, so recognizing them helps avoid errors like straw man or begging the question.
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Strategic Assumption Prediction
A strategic approach is to predict possible assumptions before reading options, enhancing accuracy in GMAT questions.
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Assumptions in Complex Arguments
In complex arguments with multiple premises, assumptions connect various parts, requiring step-by-step dissection.