Question 15 Which situation is an example of an observational study?
A. Measuring the weights of patients who come for a check-up in a
hospital
B. Asking voters about the candidate they prefer
C. 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
D. Having customers who bought a certain type of car answer
questions about their satisfaction with the car
SUBMIT