Question

Which option is an example of an observational study?

A.
Testing the effectiveness of a new reading program by allowing a classroom to use it and comparing the results with another classroom that doesn't use it

B.
Having customers who bought a certain type of car answer questions about their satisfaction with the car

C.
Testing the cholesterol levels of students at a community college

D.
Asking parents how many times a week their teenagers must be reminded to do their chores

Answer 1

i would say the answer as b too

Answer 2

B.

Having customers who bought a certain type of car answer questions about their satisfaction with the car