Of the following, which one is an observational study?
1. asking people for their opini...
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Of the following, which one is an observational study?
1. asking people for their opinion on the taste of a new cereal
2. checking the effectiveness of a new headache medicine by giving one group the new medicine and one group acetaminophen
3. tracking the temperature in a city over a five year period
4. measuring the average strength of a batch of metal by stressing some sample pieces until they deform
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