which situation is an example of an observati...
which situation is an example of an observational study?\na. asking voters about the candidate they prefer\nb. testing the effectiveness of a new reading program by allowing a classroom to use it and comparing the results with another classroom that doesnt use it\nc. having customers who bought a certain type of car answer questions about their satisfaction with the car\nd. measuring the weights of patients who come for a check - up in a hospital
Answer
# Brief Explanations:
An observational study just observes and records data without interfering. Option A is a survey, B is an experiment (has treatment and control groups), C is a survey about satisfaction. Option D just measures weights of patients without any intervention, which is an observational study.
# Answer:
D. Measuring the weights of patients who come for a check - up in a hospital