Mathematics, 26.11.2019 14:31 JayLiz1737

Astudy 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

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