Correlation: "In general, 53 percent of people say they tend to second-guess to their decisions. But among those who say that if they had a twin, they would be the evil twin, only 34 percent tend to second-guess to their decisions"

What are the strengths and weaknesses of correlational study above? Discuss concepts such as positive and negative correlation, correlation coefficients, and causality specifically with the correlational output evaluated as apart of the answer.