Mathematics, 06.10.2019 19:40 talarleonard0

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 measuring the average d. strength of a batch of metal by stressing some sample pieces until they deform

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