Unit 8 · Detecting Reasoning Errors
Science Fair Rule — Silent Gap & Contrapositive
Lesson 10 of 10
About this lesson
Now for a formally harder challenge — logical rule analysis. A rule is stated precisely and two characters each draw a conclusion from it. Your job is to evaluate whether each conclusion actually follows from the rule, or whether each person has made a subtle logical mistake.
Chapters
Question
| Whenever a student achieves a High Distinction in the school's annual Science Fair, the administration never includes their name on the list for the mandatory holiday revision program. |
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Leo: "I didn't achieve a 'High Distinction' in the Science Fair this year. However, that doesn't mean I am definitely on the list for the mandatory holiday revision program — the rule doesn't actually say what happens to students who don't get that award."
Sienna: "I just saw Sarah's name on the mandatory holiday revision program list! That means she definitely did not achieve a High Distinction in the Science Fair."
Read the school administration rule in the box. Then, decide if Leo or Sienna is using logically sound reasoning.
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