Assumption Inference
Assumption Inference problems require identifying the hidden assumptions or unstated premises that must be true for an argument to be logically valid. You must recognize what the argument takes for granted, what must be assumed for the conclusion to follow from the evidence.
What You'll Learn
Introduction to Assumption Inference
Assumption Inference problems require identifying the hidden assumptions or unstated premises that must be true for an argument to be logically valid. You must recognize what the argument takes for granted, what must be assumed for the conclusion to follow from the evidence.
Prerequisites
How to Solve Assumption Inference Problems
Step 1: Identify the conclusion and the evidence/premises
Step 2: Identify the logical gap between premises and conclusion
Step 3: Determine what unstated premise would bridge this gap
Step 4: Test the assumption using the negation test
Step 5: If negating the assumption destroys the argument, it is a necessary assumption
Step 6: Ensure the assumption is not already stated
Step 7: Select the assumption that must be true for the argument to hold
Example Problem
Example: John got promoted quickly. He must have worked very hard. What is the hidden assumption? Solution: Step 1: Premise: John got promoted quickly Step 2: Conclusion: John worked very hard Step 3: Gap: Hard work is necessary for quick promotion Step 4: Assumption: Quick promotion is achieved only through hard work Step 5: Negation test: If quick promotion can happen without hard work (e.g., luck, connections), the argument fails Answer: Hard work is the only way to get promoted quickly
Pro Tips & Tricks
- Assumptions bridge the gap between evidence and conclusion
- Necessary assumptions must be true for the argument to be valid
- The negation test: If ¬A makes argument invalid, A is a necessary assumption
- Assumptions are often about causal relationships or value judgments
- Avoid assumptions that are already stated in the premises
- Look for unstated generalizations or universal claims
Shortcut Methods to Solve Faster
Common Mistakes to Avoid
Practice Worksheets
Practice makes perfect! Work through these worksheets to master Assumption Inference. Each worksheet contains 20 questions with detailed explanations. Start from Worksheet 1 and progress through increasing difficulty levels.
Exam Importance
Assumption Inference is an important topic for various competitive exams. Here's how frequently it appears:
Ready to Master Assumption Inference?
Start with Worksheet 1 and work your way up to expert level! Each worksheet includes: