Medium LSAT Logical Reasoning Practice Test Practice Questions

Medium LSAT Logical Reasoning Practice Test Practice Questions

Logical reasoning accounts for approximately 50% of your total score on the Law School Admission Test (LSAT). This section evaluates your ability to analyze, critically evaluate, and complete arguments as they occur in ordinary language. While the LSAT Prep journey can be daunting, focusing on medium-difficulty questions allows you to bridge the gap between basic comprehension and the high-level analysis required for a 170+ score.

Concept Explanation

LSAT Logical Reasoning is a test of formal and informal logic that requires identifying the underlying structure of short arguments to determine their validity or flaws. Each question consists of a short passage (the stimulus), a question stem, and five answer choices. To succeed, you must distinguish between premises—the evidence provided—and the conclusion—the claim the author is attempting to prove. Common question types include Identifying the Flaw, Strengthening or Weakening an Argument, Finding the Assumption, and Determining the Main Point. Unlike many standardized tests, the LSAT does not require outside knowledge; all the information needed to solve the problem is contained within the text. According to the Law School Admission Council (LSAC), these questions measure skills essential to legal education, such as drawing well-supported inferences and identifying errors in reasoning.

Solved Examples

Reviewing these worked examples will help you understand the mechanics of a Medium LSAT Logical Reasoning Practice Test Practice Questions set.

1. Example 1: Flaw in the Reasoning
   Stimulus: Every time the local basketball team wears their green jerseys, they win. Therefore, the green jerseys must be the cause of their success.
   Step-by-Step Solution:
   1. Identify the Conclusion: The green jerseys cause the team to win.
   2. Identify the Premise: There is a correlation between wearing the jerseys and winning.
   3. Analyze the Logic: The author assumes that because two things happen together (correlation), one must cause the other (causation).
   4. Identify the Flaw: Confusing correlation with causation.
2. Example 2: Necessary Assumption
   Stimulus: To be elected mayor, a candidate must have the support of the labor union. Sarah does not have the support of the labor union, so she will not be elected.
   Step-by-Step Solution:
   1. Identify the Structure: If Election $\rightarrow$ Union Support. Sarah $\neq$ Union Support. Therefore, Sarah $\neq$ Election.
   2. Analyze the Logic: This is a valid application of the contrapositive.
   3. Identify the Assumption: In this case, the argument is logically sound as stated, but a necessary assumption would be that the "support of the labor union" is indeed a requirement as the premise claims.
3. Example 3: Strengthen the Argument
   Stimulus: A new study shows that people who drink chamomile tea sleep better. Thus, chamomile tea contains a sedative property.
   Step-by-Step Solution:
   1. Identify the Gap: The study shows a result (better sleep) but the conclusion identifies a specific mechanism (sedative property).
   2. Look for a Bridge: We need evidence that rules out other causes or confirms the sedative property.
   3. Solution: An answer choice stating that "Chamomile tea contains chemical compounds known to relax the central nervous system" would strengthen the link between the tea and the conclusion.

Practice Questions

Test your skills with these Medium LSAT Logical Reasoning Practice Test Practice Questions. Ensure you read the stimulus carefully before looking at the options.

1. Many economists argue that increasing the minimum wage leads to higher unemployment. However, in countries where the minimum wage was raised last year, employment rates remained stable. Therefore, the economists' theory is incorrect.
   Which of the following, if true, most weakens the argument?
2. If the library stays open late, then students will study more. If students study more, their grades will improve. Therefore, if the library stays open late, grades will improve.
3. All successful entrepreneurs are risk-takers. Some risk-takers are also mountain climbers. Therefore, some successful entrepreneurs are mountain climbers.
   The reasoning in the argument is flawed because:

4. A recent survey showed that 80% of households that own a cat also own a dog. Therefore, most dog owners also own a cat.
5. The city council should not approve the new park proposal. The lead architect of the park was once involved in a minor building code violation ten years ago.
   The argument is most vulnerable to criticism on the grounds that it:
6. Whenever the temperature drops below freezing, the pipes in the old basement burst. The pipes in the basement have not burst today. Therefore, the temperature has not dropped below freezing today.
7. A nutritionist claims that eating kale every day prevents heart disease. However, many people who eat kale every day still develop heart disease. Thus, the nutritionist's claim is false.
8. Professor Miller's new book has received rave reviews from critics. Since critics only give rave reviews to books they believe will be bestsellers, Professor Miller's book will definitely be a bestseller.

Answers & Explanations

1. Answer: The countries that raised the minimum wage were experiencing an unprecedented economic boom that offset potential job losses.
   Explanation: This weakens the argument by providing an alternative explanation for why employment remained stable despite the wage increase, suggesting the economists might still be right in a vacuum.
2. Answer: This is a valid transitive argument.
   Explanation: If A (Library) $\rightarrow$ B (Study) and B (Study) $\rightarrow$ C (Grades), then A $\rightarrow$ C is a logically sound chain.
3. Answer: It fails to establish a necessary overlap between the two subgroups of risk-takers.
   Explanation: Just because entrepreneurs are in the "risk-taker" circle and mountain climbers are in the "risk-taker" circle doesn't mean the two smaller groups must touch each other.
4. Answer: Flawed (Confusion of percentage groups).
   Explanation: 80% of cat owners is a specific number. If there are 100 cat owners and 1,000,000 dog owners, the conclusion that "most dog owners" own a cat would be false. You cannot flip the groups without knowing the total populations.
5. Answer: It attacks the character of the person rather than the merits of the proposal.
   Explanation: This is an ad hominem fallacy. The architect's past minor violation does not necessarily mean the park proposal itself is bad.
6. Answer: Valid.
   Explanation: This follows the modus tollens logical form: If P, then Q. Not Q. Therefore, not P.
7. Answer: Flawed.
   Explanation: The nutritionist said kale "prevents" (reduces likelihood or acts as a barrier), not that it is a 100% guarantee. Showing some people still get the disease doesn't prove the preventative property is non-existent.
8. Answer: It treats a necessary condition as a sufficient one.
   Explanation: Believing a book will be a bestseller is necessary for a rave review, but a rave review doesn't guarantee the book will actually become one. Critics can be wrong.

For more practice with similar logical structures, you might find our Hard GRE Critical Reasoning Questions helpful, as they share many of the same formal logic foundations as the LSAT. If you are preparing for multiple exams, you can also explore our GRE Prep resources.

Frequently Asked Questions

How many Logical Reasoning sections are on the LSAT?

Currently, the LSAT includes two scored Logical Reasoning sections, making up the bulk of the exam. This emphasizes the importance of mastering these question types for your final score.

What is the best way to improve on Medium difficulty questions?

Focus on "diagramming" conditional statements and identifying common fallacies like correlation vs. causation. Using a tool like an AI Exam Simulator can help you practice these specific difficulty levels in a timed environment.

Do I need to know formal logic symbols for the LSAT?

While you don't need to be a logician, understanding basic symbols like $P \rightarrow Q$ helps in quickly mapping out complex arguments. It prevents mental fatigue and reduces errors on "Must Be True" questions.

How do I identify the "Main Point" of a stimulus?

Look for the claim that is supported by other sentences but does not itself support any other sentence. The main point is the ultimate destination of the author's reasoning.

What is a "Flaw" question looking for?

A flaw question asks you to identify the logical error in the transition from premises to conclusion. Common flaws include internal contradictions, sampling errors, and circular reasoning.

Can I use outside information to answer Logical Reasoning questions?

No, you must strictly use the information provided in the stimulus. Bringing in outside facts—even if they are true in the real world—can lead you to select "distractor" answer choices.