Question

A study of telephones and the risk of brain cancer looked at a group of 469 people who have brain cancer. The investigators matched each cancer patient with a person of the same sex, age and race who didn’t have brain cancer, then asked about use of cell phones. This is
a) observational study
b)A matched pair experiment
c)An uncontrolled experiment
d)A randomized comparative study

Answer 1

This is an A. observational study. They are observing the use of cell phones differs between people with or without cancer.

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