LSAT Logical Reasoning Syllabus

What is the key vulnerability of an inductive generalization from a sample?

The sample may be unrepresentative — too small, biased, or not randomly selected — so it may not reliably reflect the whole population.

What is causal reasoning, and what does the LSAT typically assume about it?

Reasoning that one event causes another. The LSAT typically assumes the author, upon seeing a correlation, concludes a specific causal relationship — and that this is the ONLY cause and the direction is correct.

List the standard ways to weaken a causal argument.

(1) Show an alternative cause; (2) show the cause without the effect; (3) show the effect without the cause; (4) reverse the causal direction; (5) show the correlation is coincidental/data is flawed.

What is the maxim 'correlation does not imply causation'?

Two variables occurring together (correlation) does not establish that one causes the other; a third factor, reverse causation, or coincidence may explain the link.

What is analogical reasoning?

Reasoning that because two things share some characteristics, they likely share another. Its strength depends on the relevance and number of shared traits versus relevant differences.

How do you attack (weaken) an argument by analogy?

Show a relevant dissimilarity between the two things compared, making the analogy break down for the property in question.

Define the fallacy of 'ad hominem.'

Attacking the person making an argument rather than the argument itself, treating a source's character or motive as evidence the claim is false.

Define the 'straw man' fallacy.

Misrepresenting or distorting an opponent's position to make it easier to attack, then refuting the weaker version instead of the actual claim.

Define the 'circular reasoning' (begging the question) fallacy.

An argument whose conclusion is assumed within its premises, so the premise and conclusion essentially restate each other, providing no independent support.

Define the 'false dilemma' (false dichotomy) fallacy.

Presenting only two options as if they were the only possibilities when other alternatives exist.

Define the 'equivocation' fallacy.

Using a single word or phrase in two different senses within an argument, creating an illusion of logical connection.

Define the 'part-to-whole' and 'whole-to-part' fallacies (composition/division).

Composition: assuming what is true of the parts is true of the whole. Division: assuming what is true of the whole is true of each part.

Define the 'appeal to authority' fallacy.

Treating a claim as true merely because an authority endorses it, especially when the authority is not an expert in the relevant field or is biased.

Define the 'ad populum' (appeal to popularity) fallacy.

Concluding a claim is true because many people believe it or it is popular.

Define the 'sampling / survey' fallacy.

Drawing a conclusion about a population from a sample that is biased, too small, or self-selected, so it fails to represent the whole.

Define the 'survivorship'/'selection bias' problem in evaluating evidence.

Drawing conclusions only from cases that passed some filter (survivors/responders), ignoring the omitted cases that could change the result.

What distinguishes a strong argument from a weak argument on the LSAT?

A strong argument's premises, if true, provide solid support making the conclusion likely; a weak argument leaves gaps, relies on unwarranted assumptions, or ignores alternatives.

To strengthen an argument, what should the correct answer generally do?

Affirm or protect a key assumption, rule out an alternative explanation, or add evidence that makes the conclusion more likely to follow from the premises.

What common trap distinguishes 'Weaken' answer choices from wrong ones?

The correct weakener attacks the conclusion or the premise-conclusion link; wrong choices are often irrelevant, strengthen instead, or restate a premise without affecting the gap.

On Strengthen/Weaken questions, how much impact must the correct answer have?

It need not prove or disprove the conclusion — it only needs to make the conclusion somewhat more (strengthen) or less (weaken) likely to be true.

What is the 'elimination' (process of elimination) technique?

Systematically crossing out answer choices that are wrong (irrelevant, out of scope, extreme, or reversed) to isolate the credited response, rather than confirming one directly.

Name red-flag words that often signal a wrong (too strong) answer choice.

all, none, always, never, every, only, must, cannot, impossible — extreme absolutes rarely match measured argumentation unless the stimulus supports them.

What is an 'out of scope' answer choice?

A choice introducing a topic, term, or comparison not addressed by and not relevant to the argument's scope — a common wrong-answer type to eliminate.

What is the 'opposite answer' trap?

A choice that does the reverse of what the question asks (e.g., strengthens on a Weaken question). It is tempting because it is clearly relevant but points the wrong direction.

Why is identifying the question STEM before reading the stimulus a useful strategy?

Knowing the task (weaken, assume, flaw, etc.) focuses your reading so you note the relevant structure and gap, improving speed and accuracy.

What do the phrases 'some,' 'most,' and 'all' mean quantitatively in LSAT logic?

'Some' means at least one (>0); 'most' means more than half (>50%); 'all' means 100%. 'Most' and 'most' can overlap but do not guarantee 'some' inference chains without care.

How do the key phrases 'necessary condition' and 'sufficient condition' differ?

A sufficient condition guarantees the outcome (if A then B: A is sufficient for B). A necessary condition is required for the outcome (B is necessary for A). Sufficient is the trigger; necessary is the requirement.

What is a good time-management benchmark per Logical Reasoning question?

Roughly $1.25$ minutes per question on average (about 35 minutes for ~25 questions), spending less on easy early questions to bank time for harder later ones.

What time-management strategy handles a question you cannot solve quickly?

Make your best educated elimination, mark it, guess (never leave blank — no wrong-answer penalty), and move on to preserve time for solvable questions.

Why should you never leave an LSAT Logical Reasoning question blank?

There is no penalty for wrong answers, so an unanswered question is a guaranteed miss while a guess retains roughly a $\frac{1}{5}$ chance of being correct.

What is the difference between a 'Flaw in the Reasoning' question and a 'Weaken' question?

A Flaw question asks you to describe the error in the argument's logic as given; a Weaken question asks you to supply new information that undermines the conclusion.