SME
Grade 11 Math · Problem type
Survey, observational study or experiment?
Use this for “Researchers compare the heart rates of runners and non-runners. What kind of study is this?”
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What kind of study is it?
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Assumptions
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A survey asks a sample questions.
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An observational study records what people already do; nothing is assigned.
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Only an experiment assigns the treatment, so only an experiment can show cause and effect.
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Related lessons
Sampling methods and study design: surveys, experiments and observational studies
Main lesson
Which sampling method?
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Name the bias
Use this for “A website asks readers to vote in a poll. What kind of bias is this?”