Observational vs Experimental Studies Math Example 3
Follow the full solution, then compare it with the other examples linked below.
Example 3
easyA researcher asks 500 adults about their exercise habits and mental health. Is this observational or experimental? What is the strongest conclusion possible from this study?
Solution
- 1 Type: observational — the researcher only surveys; does not assign exercise levels
- 2 Strongest conclusion: association — people who exercise more tend to have better mental health
- 3 Cannot conclude: exercise causes better mental health (reverse causation is possible — better mental health enables exercise; or confounders like wealth explain both)
Answer
Observational study. Can conclude association only, not that exercise causes better mental health.
Surveys and records-based studies are always observational. The researcher has no control over who exercises how much. Even a large, well-designed observational study can only establish correlation, not causation.
About Observational vs Experimental Studies
An observational study records data without imposing treatments, while an experiment deliberately manipulates a variable. Only experiments with random assignment can establish causation; observational studies can only show association.
Learn more about Observational vs Experimental Studies →More Observational vs Experimental Studies Examples
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