Lesson · S.4.2
Logic and evidence in a scientific explanation
How to judge whether a scientific conclusion is actually supported by its data, and the difference between a cause and a coincidence.
ObjectiveS.4.2Read2 minExam weightScientific Reasoning ≈ 21% of Science
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See editions and pricing →What you will be able to do
- Judge whether a scientific conclusion is actually supported by its data.
- Recognize bias in a study design, including the role of a placebo group.
- Distinguish a causal relationship from mere correlation.
What the lesson concludes
- Reproducible results across multiple trials support a conclusion far more than a single striking result.
- A placebo group and unaware participants guard against bias skewing the outcome.
- Keeping every variable but one constant is what lets a study point to a cause rather than a coincidence.
- Small sample sizes and uncontrolled variables both weaken a conclusion, even when the reported numbers look convincing.
- Read the method the study used before you accept the conclusion it draws from its data.