Which among the following is most useful in establishing cause-and-effect relationships?
A) A complete census
B) A least squares regression line showing high correlation
C) A simple random sample
D) A well-designed, well-conducted survey
E) A controlled experiment
Answer: a controlled experiment
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.