Separate deduction from prediction
See this course’s project requirements
An argument-audit packet with a premise map, conditional tests, counterexamples, repaired reasoning, certainty labels, and a final evidence-based room recommendation.
Keep your working files in your own notebook or software. Save a private description, checklist, and work link in My Proof.
What to include
- Identify premises, conclusion, and assumptions.
- Test conditional direction and create valid counterexamples.
- Explain and repair irrelevant or incomplete reasons.
- Distinguish rule-based conclusions from uncertain predictions.
- Produce the final map with a clear change trigger.
Review and revise
Use these criteria to check your work and choose what to improve.
- Argument roles are correctly identified.
- Counterexamples have the required true-condition/false-result structure.
- Revisions address the actual evidence gap.
- Final conclusions follow the supplied facts without hidden assumptions.
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The idea in everyday life
Fictional facts: policy guarantees any room with fewer than 20 seats is unsuitable for this workshop. A has 16 seats. Over the last five Friday meetings, B was quiet four times. Someone concludes B will certainly be quiet next Friday. A maintenance event is scheduled nearby next Friday.
A rule-based deduction and an evidence-based forecast have different certainty.
Separate deduction from prediction: guided practice
A rule-based deduction and an evidence-based forecast have different certainty.
Use paper or a free local text editor. This is an original fictional practice case; do not submit its records to a real service. Start this lesson with these facts, even if an earlier variation changed them. Fictional facts: policy guarantees any room with fewer than 20 seats is unsuitable for this workshop. A has 16 seats. Over the last five Friday meetings, B was quiet four times. Someone concludes B will certainly be quiet next Friday. A maintenance event is scheduled nearby next Friday.
1. Apply the rule
Evaluate A using the stated minimum capacity.
You should see: A is unsuitable under the rule because 16 is below 20.
Given true premises, this follows deductively.
2. Classify the prediction
Label the quiet-room claim as a prediction from past observations.
You should see: Four of five past meetings support a tentative expectation, not certainty.
Past cases do not logically guarantee the next case.
3. Add new evidence
Record the nearby maintenance as a reason to update the expectation.
You should see: The next Friday may differ from the past pattern.
Relevant new conditions can weaken a prediction.
4. Write calibrated language
Rewrite both conclusions with appropriate strength.
You should see: A fails the stated seat requirement; B has often been quiet, but next Friday needs checking.
Calibrated language separates a firm rule conclusion from uncertainty.
What to finish
Separate deduction from prediction record with the worked decisions and changed-case check.
Watch for this
Using words such as always and guaranteed for a prediction from a few past cases.
How can I tell I understand it?
Distinguish conclusions guaranteed by rules from predictions based on past cases. Explain the evidence behind the result and correct any mismatch.
Quick knowledge check
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Answer all 3 questions above and get at least 2 right. You can review the explanations and try again.
Go to the knowledge checkOptional course overview video · same video as Lesson 1
How to Argue - Philosophical Reasoning: Crash Course Philosophy #2
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Source & access notes · checked 2026-09-12
Inspected conditional forms, counterexamples, and deductive versus inductive inference.
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