uchicago wrote:Hi there,
I have few lr questions, can you help me out?
first, pre 27,sec 1, 3-4
the stimul did not talk about "same age" or assume blackbirds are same age, so why d is right?
for question 4, it was about blackbirds, so i am confused about "differernt specisies"....
prep 27,14, i chose C, and completely confused by the wording in B...
prep 20,sec 1,question 14
pprep24, sec2,question 17, i chose D, was it due to the "new info" about minor power introduced?
Thanks a lot!!
PT 27, S1, Q3-4
This stimulus is an argument within an argument. Yasukawa believes that size is a determinant of a blackbird's survival chances and bases his conclusion on a study in which the percentage of smaller birds who survived over the month-long period exceeded the larger birds. The author objects to this conclusion (rightly so because it's based on correlation-causation reasoning) because Yasukawa fails to realize that smaller birds are generally younger than larger ones, meaning that age, not size, accounts for why smaller birds lived longer.
Q3 asks to find an inference (Must Be True). Even though the stimulus doesn't talk specifically about "age", we can infer from how the author objects to Yasukawa that what matters is the birds' AGE and not SIZE that determines their chances of survival. Therefore, in accordance with the author's conclusion, for two birds of the same age, their size may not be a determinant of their chances for survival.
Q4 asks us to critique the author's argument based on a misunderstanding of Yasukawa's argument. The author assumes that Yasukawa's study was based on blackbirds of the same species but of different sizes. However, what if Yasukawa was studying two different types of species -- one large and one small? If this were true, then size and age aren't really related. This question could have been answered using Process of Elimination (POE) as well. None of the other four answer choices pertained to the information in the stimulus, such as chances of survival, size, and age.
PT 27, S1, Q14 - The critic claims that it's not really important that many popular psychological theories are poor theories, since therapeutically they tend to have greater success than their scientific rivals. The question asks what the role of the last statement (about the relative success of popular psych theories) plays in the argument. You can prephrase this answer by thinking about how that statement plays into the overall argument. Here's how the stimulus breaks down:
Premise 1: Many popular psychological theories are poor theories in that they are inelegant and do not help to dispel the mystery that surrounds our psyche.
Conclusion: However, this is not really important.
Premise 2: The theories produce the right results: therapeutically, they tend to have greater success than their more scientific rivals.
Premise 2 functions to support the reasoning behind the Conclusion as well as to suggest that Premise 1's concerns are not as important as their rate of success in evaluating popular psych theories. In other words, according to the author, despite some of the shortcomings of these theories, the more important factor is that they are MORE successful. Answer C is incorrect because it exaggerates the author's argument -- she is not saying that popular psych theories are actually better scientific
explanations than their rivals; she is only saying that they have a better rate of
therapeutic success.
PT 20, S1, Q14 - Arjun disagrees with Yolanda using a scenario that COULD be true to support a definite conclusion ("Unauthorized use of medical records systems in hospitals
could damage data systems on which human lives depend, and therefore computer crimes
also cause physical harm to people.") This type of reasoning error is very common on the LSAT. Something that could be true doesn't lead to a definite conclusion. Just as a survey taken to show how people FEEL about a certain situation doesn't reflect on the ACTUAL situation (an example taken from another LSAT question).
PT 24, S2, Q17 - This is a Necessary Assumption question, so we need to find the foundation of the reasoning behind the structure of the Security Council is the way it is after WWII. The stimulus states that an 11-member Security Council was established to maintain world peace, but that only five nations who were THEN the major powers would permanently have sole authority to cast vetoes. The reason for this arrangement is that the burden of maintaining world peace would rest on these five major powers' shoulders, and no single nation should be required to enforce a decision it found repugnant.
The stimulus is worded very abstractly, so I think it would benefit us to put some names to the nations. Let's assume that the five major powers in 1946 were Russia, Great Britain, USA, China, and France, so they're the only ones with permanent veto power. Well, what if Saudi Arabia became a major power in the 1990s? The charter would deny this country veto power, and as a major power, it would not be able to veto a decision it found repugnant, which goes against the charter's reasoning. The charter assumes that the countries that were major powers at the end of WWII would forever be major powers. So, if you logically negated answer choice B, the charter's reasoning (or argument) would fall apart.
Answer D is incorrect because the actions of the minor powers have no effect on the major powers' veto power. Even if minor powers allied themselves with major powers, at the end of the day, major powers still have veto power. This does not need to be true in order for the charter's reasoning to be valid.