Statistics › Section A · Sampling and data › Topic A.5
Experimental design and ethics
Does the programme work? A well-designed experiment is the clearest way to find out. This topic covers the vocabulary of experiments, the design principles that turn data into evidence, and the ethical rules that keep that evidence honest.
In this topic
- What experiments are for
- Observational studies versus experiments
- Explanatory variables, response variables, treatments
- Lurking variables and confounding
- Random assignment
- Control and replication
- Blinding and the placebo effect
- Worked example: designing a tutoring experiment
- Worked example: when an experiment is impossible
- Ethics: honest data and fair treatment
- Common mistakes to avoid
- Key takeaways
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