LSAT Reading Comprehension: Additional Evidence

Rank 15 by frequency | 7 questions in corpus (0.3% of all questions)

A rare type that asks the test-taker to identify what kind of evidence would be relevant to evaluating a claim, what the passage itself cites as evidence, or what kind of information would bear on a hypothesis. Unlike Strengthen (which always asks for hypothetical supportive evidence), Additional Evidence is broader — it can ask what evidence the passage already cites, what data would be relevant (not necessarily supportive), or what evidence would help answer a question posed by the passage.

- Evidential relevance: Understanding what counts as meaningful evidence for a particular claim or hypothesis - Evidence identification: Locating what the passage presents as supporting evidence - Data-claim matching: Connecting specific types of data to specific claims they could help evaluate - Scientific reasoning: Understanding what observations, experiments, or data sources would bear on a hypothesis

What It Tests

  • Evidential relevance: Understanding what counts as meaningful evidence for a particular claim or hypothesis
  • Evidence identification: Locating what the passage presents as supporting evidence
  • Data-claim matching: Connecting specific types of data to specific claims they could help evaluate
  • Scientific reasoning: Understanding what observations, experiments, or data sources would bear on a hypothesis

Within-Type Variations

With only 7 questions in the corpus, each example is essentially its own variant, but three broad subtypes emerge:

Variation A: "Passage presents X as evidence of..." (2 questions — 29%)

Asks what the passage itself cites as evidence for a claim — essentially a detail question about evidential structure. - "Which one of the following is presented by the author as evidence of [X]?"

What makes it distinct: Looks backward into the passage rather than forward into hypotheticals. The test-taker must identify which of the passage's stated facts the author deploys as evidence for a specific claim.

Variation B: "Data most relevant to evaluating..." (2 questions — 29%)

Asks what kind of data would help evaluate (not necessarily support) a claim or hypothesis. - "Data from which one of the following sources would be most relevant to evaluating [person]'s hypothesis?" - "Which one of the following is most clearly an example of the kind of evidence that would lend support to [X]?"

What makes it distinct: "Relevant to evaluating" is broader than "would strengthen" — the evidence might confirm OR refute the hypothesis. The test-taker must identify what type of data would be informative.

Variation C: "Passage contains information to answer..." (2 questions — 29%)

Asks which question the passage provides enough information to answer. - "The passage contains information that most helps to answer which one of the following questions?"

What makes it distinct: A meta-question about what the passage's evidence can address. Overlaps with Specific Reference ("information sufficient to answer") but is classified as Additional Evidence when it focuses on evidential sufficiency rather than factual retrieval.

Variation D: "Evidence that would lend support to..." (1 question — 14%)

Asks what type of evidence would support a specific proposal or model. - "Which one of the following is most clearly an example of the kind of evidence that would lend support to the author's proposal in [section]?" - "It can be inferred that the author would be more likely to endorse [model] if this model were supported by which one of the following kinds of evidence?"

What makes it distinct: Closest to Strengthen, but frames the task as identifying the kind of evidence rather than a specific hypothetical fact.

Construction Logic — How Additional Evidence Questions Are Built

Step 1: Identify the Evidential Relationship

The question writer identifies either: - A claim the passage makes and the evidence it cites for it (Variation A) - A hypothesis that specific types of data could help evaluate (Variation B) - A question the passage's evidence can answer (Variation C) - A model that specific evidence types would support (Variation D)

Step 2: Write the Correct Answer

For Variation A: The answer names evidence the passage explicitly cites. For Variations B-D: The answer describes data or evidence that: - Bears directly on the targeted claim/hypothesis - Could genuinely help evaluate (not just tangentially relate to) the claim - Is the most relevant or supportive option among the five choices - Is specific enough to be actionable (not vague)

Step 3: Construct Wrong Answers

Trap Type 1: Topically Related but Evidentially Irrelevant Data about the passage's subject that doesn't actually bear on the specific claim. If the hypothesis is about horse domestication, data about ancient climate patterns in the region is related but irrelevant.

Trap Type 2: Evidence for Wrong Claim Data that would help evaluate a different claim in the passage, not the one the question targets.

Stem Characteristics

Average 23.7 words. Stems vary significantly because this type spans multiple subtypes (evidence cited, evidence relevant, evidence sufficient).

Answer Characteristics

Average 16.0 words. Choices describe types of evidence, data sources, or questions. They range from concrete ("tabulation of the number of butchered horse bones") to more abstract ("evidence of controlled burning practices").

Official Content — Complete Corpus (All 7 Questions)

| # | Source | Difficulty | Subtype | Target | |—|—|—|—|—| | 1 | PT38, Q4 | 3 | Evidence passage cites | Pre-European controlled burning in tropics | | 2 | PT51, Q13 | 4 | Evidence to support view | Late Heavy Bombardment limited to Earth/Moon | | 3 | PT66, Q22 | 4 | Information passage can answer | Characteristic of Jazz also in other African American works | | 4 | PT79, Q17 | 3 | Evidence lending support | Author's proposal about forest clearings | | 5 | PT79, Q20 | 3 | Evidence author would want | Resource-procurement model for clearings | | 6 | PT84, Q25 | 3 | Evidence supporting claim | Authors' claim about biological adaptation speed | | 7 | PT85, Q14 | 4 | Data relevant to evaluating | Olsen's hypothesis about Botai horse domestication |

Distribution note: All 7 questions appear on single passages. None appear on comparative passages. The type concentrates in recent PrepTests (PT79, PT84, PT85) with earlier appearances scattered.

Difficulty Modifiers

  • Base difficulty: 3
  • Stays at 3: When the passage clearly identifies its evidence and the question asks the test-taker to locate it
  • Raised to 4: When the question asks for hypothetical evidence and the test-taker must evaluate evidential relevance from multiple options
  • Raised to 5: When the evidential relationship is indirect or when the hypothesis being evaluated is complex

Passage Type Split

  • Single passages: 7 (100%)
  • Comparative passages: 0 (0%)
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