The health and lifestyle of 10,000 nurses are tracked for a period of 30 years.It is discovered that of the nurses who smoked cigarettes for at least 10 years,35% had lung cancer.Is this an observational or an experimental study? Does this study demonstrate that cigarettes cause lung cancer?
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A)It
A)when changing one variable
A)experimental
B)variable
C)correlational
D)observational
E)demonstrative
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