LSAT 2 – Section 4 – Question 16

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October 1991

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Question QuickView	Type	Tags	Answer Choices	Curve This gives you an idea of how this question is “curved”— in other words, what level of scorer is likely to get this question right. It shows a model of scaled LSAT score vs probability of getting the question correct. It is based on student test results for each question. The gray bar extends from the score for a 25% chance, to the score for a 75% chance of getting the question correct. The black line in the middle is the score for a 50% chance of getting the question correct. The percentage at the right is the expected chance of someone with the same score as you on that PrepTest getting that question correct	Question Difficulty	Psg/Game/S Difficulty	Explanation

Question QuickView	Type	Tags	Answer Choices	Curve This gives you an idea of how this question is “curved”— in other words, what level of scorer is likely to get this question right. It shows a model of scaled LSAT score vs probability of getting the question correct. It is based on student test results for each question. The gray bar extends from the score for a 25% chance, to the score for a 75% chance of getting the question correct. The black line in the middle is the score for a 50% chance of getting the question correct. The percentage at the right is the expected chance of someone with the same score as you on that PrepTest getting that question correct	Question Difficulty	Psg/Game/S Difficulty	Explanation
PT2 S4 Q16	+LR	Weaken +Weak	A 3% 144 B 3% 149 C 90% 161 D 1% 147 E 3% 148	134 141 148	+Easier	145.613 +SubsectionMedium

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This is a weakening question: Which one of the following, if true, would cast doubt on the experimenters’ conclusion?

Our stimulus begins with a definition of nuclear fusion; nuclear fusion is a process where nuclei fuse and release energy. We then learn that this process creates a by-product; helium-4 gas. Having established this context, we now learn about an experiment involving “heavy” water. I don’t know about you, but I have no idea what “heavy” water is; luckily the LSAT is about our reasoning skills and not chemistry. We learn that the water is contained in a sealed flask within an air-filled chamber, and that after the experiment some Helium-4 was found in the chamber. The people running the experiment concluded that there must have been nuclear fusion that happened. Since this is a weakening question involving a hypothesis, we should look for an alternate hypothesis in the answer choices, an alternate possible explanation for why there was helium-4 in the chamber. Let’s see what we get:

Answer Choice (A) The researcher’s explanation is entirely compatible with this.

Answer Choice (B) But was it fusion that produced the helium-4?

Correct Answer Choice (C) We are told the chamber was air-filled, so we would therefore expect that level of helium-4. This is a much better explanation than that nuclear fusion occurred!

Answer Choice (D) But it was helium-4 they found. If anything this suggests the helium-4 was recently produced which might support the fusion hypothesis.

Answer Choice (E) Cool, but we weren’t told anything about heat; for all we know there was a large release of heat and our experiment runners hypothesis is entirely correct.

LSAT 2 – Section 4 – Question 16

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LSAT PrepTest 2 Explanations

Section 1 - Reading Comprehension

Section 2 - Logical Reasoning

Section 3 - Logic Games

Section 4 - Logical Reasoning

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