Hard LSAT Evaluate Questions With Answers Practice Questions

Concept Explanation

LSAT Evaluate questions identify the specific piece of information that would most effectively determine whether a given argument is valid or invalid. These questions function as a hybrid between Strengthen and Weaken tasks, requiring you to find a "crucial unknown" that could either bolster or break the logical bridge between the premises and the conclusion. When tackling hard LSAT evaluate questions with answers, the most powerful tool at your disposal is the Variance Test. This involves taking an answer choice and applying two extreme, opposite responses to it; if one response strengthens the argument and the other response weakens it, that choice is the correct answer. This diagnostic method ensures you are selecting a factor that is central to the argument's integrity rather than a tangential detail.

To excel in this section of the LSAT Prep curriculum, you must first isolate the conclusion and the supporting evidence. Look for shifts in scope, such as an argument that moves from a discussion of "revenue" to a conclusion about "profit." The gap between these two concepts is where the evaluate question will focus. Because these are higher-difficulty questions, the correct answer often uses abstract language or addresses a subtle assumption that isn't immediately obvious. By using our AI Question Generator, you can practice identifying these gaps across thousands of unique logical scenarios.

Solved Examples

1. The Tech Startup Case: A startup claims that because their new app was downloaded 1 million times in its first month, it will definitely be profitable by the end of the year.
   Question: Which of the following is most important to evaluate the conclusion?
   Solution:
   1. Identify the gap: Downloads (volume) do not equal profit (revenue minus costs).
   2. Apply the Variance Test to the potential answer: "The cost of maintaining servers for each active user."
   3. Extreme 1: If costs are $0.01 per user, the conclusion is strengthened.
   4. Extreme 2: If costs are $10.00 per user, the conclusion is weakened.
   5. Conclusion: This is the correct evaluation factor.
2. The Rare Bird Study: Ornithologists observed a rare bird species in a specific forest tract only during the winter. They concluded that the bird must migrate to a different climate during the summer.
   Question: What must be determined to evaluate this argument?
   Solution:
   1. Premise: Observed only in winter. Conclusion: It migrates in summer.
   2. Identify the assumption: The bird is visible/detectable in the summer if it is there.
   3. Variance Test: "Whether the bird's plumage or behavior makes it virtually invisible during summer months."
   4. Extreme 1 (Yes): If it's invisible, it might still be there; the migration theory is weakened.
   5. Extreme 2 (No): If it's easily seen, its absence suggests it really did leave; the theory is strengthened.
3. The Corporate Wellness Program: Company X introduced a gym membership subsidy, and insurance claims dropped by 15% the following year. Management concluded the subsidy caused the health improvement.
   Question: Which of the following is most useful to know?
   Solution:
   1. The argument assumes a causal link between the gym and the claims.
   2. Look for outside factors: Did the workforce change?
   3. Evaluate: "Whether Company X hired a significantly younger demographic of employees during that same year."
   4. If yes, the age change might explain the drop (weakens). If no, the gym subsidy remains the likely cause (strengthens).

Practice Questions

1. A local government decided to increase property taxes to fund a new park, arguing that the park will increase overall property values in the neighborhood. To evaluate this claim, it would be most helpful to know whether:

1. Neighboring towns have more parks than this town.
2. The increase in property taxes is greater than the projected increase in property value provided by the park.
3. The park will include a playground and a dog run.
4. Property values have been stagnant for the last five years.

2. Recent data shows that people who drink green tea daily have a lower incidence of heart disease than those who do not. Therefore, the antioxidants in green tea must be the primary reason for this improved cardiovascular health. Which of the following is most important to determine?

1. Whether green tea drinkers also tend to engage in more frequent exercise than non-tea drinkers.
2. The specific type of antioxidants found in green tea versus black tea.
3. How many cups of green tea are required to see a health benefit.
4. If the study was funded by a tea manufacturing conglomerate.

3. A pharmaceutical company claims its new drug is more effective than the current industry standard because 80% of patients in their trial reported symptom relief, compared to 65% for the standard drug. To evaluate this, one should ask:

1. Were the patients in the two groups suffering from symptoms of similar severity?
2. Does the new drug have more side effects than the standard drug?
3. How much does the new drug cost compared to the standard drug?
4. Was the trial conducted over a period of six months?

4. An environmentalist argues that switching to electric vehicles (EVs) will immediately reduce a city’s carbon footprint. This conclusion depends on which of the following being determined?

1. The percentage of residents who currently own more than one gasoline-powered vehicle.
2. Whether the electricity used to charge the EVs is generated from fossil fuels or renewable sources.
3. The average distance a resident drives in a single day.
4. If the city provides tax incentives for the purchase of new electric vehicles.

5. A law school claims that its new curriculum is a success because the bar passage rate increased by 10% in the first year it was implemented. To evaluate this, it is most useful to know:

1. If the national average bar passage rate also increased by a similar margin that year.
2. The total number of students who graduated from the law school that year.
3. Whether the students liked the new curriculum more than the old one.
4. How many faculty members were involved in designing the new curriculum.

6. Scientists found that a certain species of fish thrives in water with high acidity. They concluded that increasing ocean acidification due to climate change will not harm this species. To evaluate this, it is necessary to determine:

1. Whether the prey that this fish species relies on can survive in high-acidity water.
2. If other fish species in the same region are also acid-tolerant.
3. The exact pH level of the ocean ten years ago.
4. How quickly the acidity of the ocean is expected to rise.

7. A retailer decided to move its physical store to a high-traffic urban center to increase sales. However, the store's monthly profit actually decreased. To understand why, it is most helpful to ask:

1. Did the increase in rent and operating costs exceed the increase in revenue from the higher foot traffic?
2. How many competitors are located within a five-block radius of the new store?
3. What percentage of the high-traffic pedestrians are within the retailer's target demographic?
4. Did the retailer change its advertising strategy during the move?

8. A study found that children who play chess score higher on standardized math tests. The researchers concluded that learning chess improves mathematical ability. Which of the following is most important to evaluate this conclusion?

1. Whether children with a natural predisposition for math are more likely to take up chess in the first place.
2. If the math tests were administered by the same people who taught the chess classes.
3. The age at which the children first started playing chess.
4. Whether the children also played other board games like checkers or backgammon.

Answers & Explanations

1. Answer: B. The argument is that the park will increase property values. However, if the tax hike required to build it is $10,000 per home and the value only increases by $5,000, the "value" to the homeowner is effectively negative. This addresses the economic logic of the claim.
2. Answer: A. This identifies a potential confounding variable. If green tea drinkers are generally more health-conscious (exercise more), then the tea might not be the cause of the heart health; the lifestyle might be.
3. Answer: A. For a comparison to be valid, the two groups must be similar. If the 80% group had mild symptoms and the 65% group had severe symptoms, the new drug might not actually be better.
4. Answer: B. If the electricity for EVs comes from coal plants, the city's total carbon footprint might not decrease at all. This is a classic "hidden step" in environmental arguments.
5. Answer: A. This provides context. If every school's passage rate went up by 10% because the exam was easier, the new curriculum isn't necessarily the cause of the success.
6. Answer: A. This is a "big picture" question. A species can be personally resistant to acid, but if its food source dies off due to that same acid, the species will still suffer.
7. Answer: A. Profit is Revenue minus Expenses. Even if sales (revenue) went up, a massive spike in rent (expenses) would cause profit to drop.
8. Answer: A. This addresses the "correlation vs. causation" flaw. If math-inclined kids choose chess, then chess didn't cause the math ability; the ability preceded the chess.

Frequently Asked Questions

How is an Evaluate question different from a Strengthen question?

A Strengthen question asks for a fact that makes the conclusion more likely to be true. An Evaluate question asks for a question or piece of information that could either strengthen or weaken the conclusion depending on the answer.

Can I use the Negation Test on Evaluate questions?

While the Negation Test is designed for Necessary Assumption questions, a similar logic applies. However, the Variance Test is superior because it accounts for the two-sided nature of the evaluation task.

What should I do if two answers seem relevant?

Apply the Variance Test to both. The correct answer will have a much more dramatic impact on the conclusion's validity, whereas the distractor will only have a marginal or tangential effect.

Do Evaluate questions appear frequently on the LSAT?

They are less common than Flaw or Strengthen questions but are considered high-yield because they test the same underlying logical structures. Mastering them improves your performance on all Logical Reasoning types.

How do I handle "Hard" Evaluate questions with complex language?

Simplify the argument into "If [Premise], then [Conclusion]." Focus on the relationship between the two parts rather than the dense technical jargon often used in the stimulus. You can use our AI Lecture Notes Enhancer to break down complex logical patterns into simpler summaries.