Statement Assumption
What you'll learn
- Distinguish between implicit and explicit assumptions
- Evaluate whether an assumption is valid for a given statement
- Judge a course of action as appropriate or not
- Identify strong arguments from weak ones
Key concepts
What is an Assumption?
An assumption is something that is taken for granted — an unstated belief that must be true for the statement to make sense. It is not directly stated in the statement.
| Type | Definition | Example |
|---|---|---|
| Explicit | Directly stated in the statement | "Close the door because it is cold." (Closing keeps warmth.) |
| Implicit | Implied but not stated | Same sentence assumes: "The door can be closed." |
Rule for validity: An assumption is implicit and valid if (1) it is NOT already stated in the statement, (2) it is necessary for the statement to be logical, and (3) it is a reasonable, commonly accepted belief.
Testing an Assumption — The Negation Test
If you negate (reverse) an assumption and the statement becomes meaningless or illogical, the assumption IS implicit and valid.
Worked Example: Statement: "Eat fruits daily to stay healthy." Assumption: "Fruits help maintain good health."
Negate: "Fruits do NOT help maintain good health." Result: If fruits don't help health, the advice makes no sense. → Assumption IS valid. ✓
Worked Example 2: Statement: "Wear a helmet when riding a motorcycle." Assumption: "Helmets can prevent head injuries."
Negate: "Helmets cannot prevent head injuries." Result: If that were true, there would be no reason to wear one. → Assumption IS valid. ✓
Invalid assumption example: Statement: "Visit the new mall this weekend." Assumption: "The mall is open every day."
Negate: "The mall is not open every day." Result: It could still be open on weekends. The statement is still logical. → Assumption is NOT necessarily valid. ✗
Course of Action
A course of action is a step or measure taken in response to a problem or situation. You must judge whether it is practical, effective, and directly addresses the problem.
Criteria for a VALID course of action:
- It directly targets the cause of the problem.
- It is practically implementable.
- It is not vague or extreme without justification.
Worked Example: Problem: Many students fail in mathematics. Course of Action I: Ban mathematics from the curriculum. Course of Action II: Provide additional coaching classes for struggling students.
- CoA I: Extreme and counterproductive — does not solve the problem. ✗
- CoA II: Practical, targeted, and feasible. ✓ Valid.
Statement and Conclusion
A conclusion must be directly derivable from the statement — nothing more, nothing less.
Worked Example: Statement: "More people are using public transport since fuel prices rose." Conclusion I: High fuel prices reduce private vehicle use. Conclusion II: Public transport is now free.
- Conclusion I: Logically follows — high prices → people switch to public transport → private use reduces. ✓
- Conclusion II: Not stated or implied anywhere. ✗
Tip: A conclusion should not go beyond what the statement explicitly or logically supports. Watch out for conclusions that are too broad or introduce new information.
Strong vs Weak Arguments
An argument is given for or against a proposal. You must decide if it is strong (relevant, factual, directly connected) or weak (vague, emotional, or irrelevant).
| Strong Argument | Weak Argument |
|---|---|
| Based on evidence or fact | Based on emotion or opinion |
| Directly related to the proposal | Talks about a different issue |
| Covers a significant portion of the affected group | Covers a very rare or extreme case |
Worked Example: Proposal: "Schools should ban mobile phones." Argument for: "Mobile phones distract students during class." Assessment: Direct, factual, widely observed. → Strong ✓
Argument against: "Some students might miss emergency calls." Assessment: Rare case; most schools have landlines for emergencies. → Weak ✗
Putting It All Together
| Question type | Key question to ask |
|---|---|
| Statement-Assumption | Is this assumption necessary and unstated? (Use negation test) |
| Course of Action | Is this practical and does it address the root cause? |
| Statement-Conclusion | Does this follow logically without adding new information? |
| Strong/Weak Argument | Is this based on fact and directly relevant? |
Quick check
- Statement: "Please bring an umbrella." What implicit assumption is being made?
- Negate this assumption and test it: "Vegetables are essential for a balanced diet."
- Problem: Roads are in poor condition. Is "Hold a public rally" a valid course of action? Justify.
- Statement: "All toppers in the school study for 8 hours a day." Conclusion: "Studying 8 hours guarantees being a topper." Does this conclusion follow?
- Classify as strong or weak: Proposal — ban junk food in schools. Argument — "Children love eating junk food."
Open the Practice tab for graded questions on Statement and Assumption.
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