In order to determine if smoking causes cancer researchers survey a large sample
ID: 3070631 • Letter: I
Question
In order to determine if smoking causes cancer researchers survey a large sample of adults. For each adult they record whether the person smoked regularly at any time in his or her life and whether the person has or ever had cancer. The researchers compare the proportion of cancer cases among those who smoked regularly with those who have not. This is ____________________________
an observational study
a designed experiment.
a census
A.an observational study
B.a designed experiment.
C.a census
Explanation / Answer
The researchers compare the proportion of cancer cases among those who smoked regularly with those who have not. This is an Observational study.
Since the Independent variable is not under researchers control.
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