Of the following, which one is an observational study?
A Asking people for their opinion on the taste of a new cereal
B. Checking the effectiveness of a new headache medicine by giving one group the new medicine and one group acetaminophen
C. tracking the temperature in a city over a five year period
D. measuring the average strength of a batch of metal by stressing some sample pieces until they deform
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Home » Mathematics » Of the following, which one is an observational study? A Asking people for their opinion on the taste of a new cereal B. Checking the effectiveness of a new headache medicine by giving one group the new medicine and one group acetaminophen C.