Question

A study of cell phones 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 did not have brain cancer, then asked about use of cell phones. This is
A. an observational study.
B. an uncontrolled experiment.
C. a randomized comparative experiment.

Answer 1

I think A?

Answer 2

...i suppose you found your answer..?

Answer 3

yeah it's A. Damn I'm good.

Answer 4

HAha iggy didn't know oyu were coming. Now gimme a medal.

Answer 5

for what?

Answer 6

for being correct.

Answer 7

i give medals to askers for cooperation...not for being correct so hah